(cherry picked from commit 73cbad2f)

(cherry picked from commit 50367416)

(cherry picked from commit 7361ffd2)

* Now compiling in a separate directory using truffle 5.

* Ported to 0.5.1, now compiling using 0.5.1.

* test now also compiles using the truffle 5 hack.

* Downgraded to 0.5.0.

* Sorted scripts.

* Cleaned up the compile script a bit.

* Made the Crowdsale's constructor public again.

* Added changelog entry.

* Made all but Finalizable public.

* signed safe math

* fix lint errors

* refactor overflow checks and add descriptions

* remove incorrect description

* add test for reversed arguments in multiplication test

* fix power operator

* improve multiplication test descriptions

* Update SafeMath.test.js

* add feature to changelog

* Added changelog.

* Added PR template note.

* Update .github/PULL_REQUEST_TEMPLATE.md

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Update PULL_REQUEST_TEMPLATE.md

* Update CHANGELOG.md

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Update CHANGELOG.md

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Apply suggestions from code review

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Added more headers and sub-headers.

* Added deprecations category.

* Added PR links.

* Added PausableCrowdsale.

* Addressed review comments.

* Update CHANGELOG.md

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Added PausableCrowdsale contract

* Changed inheritance order to prevent "Linearization of inheritance graph impossible" error

* Updated mock PausableCrowdsaleImpl to new constructor syntax

* Broke function definition to multiple lines

Comply with new max line length

* Rename events to past-tense in PausableCrowdsale test

* Removed should.be.fullfilled from PausableCrowdsale tests

* Change import assertRevert to require in PausableCrowdsale tests

* Remove dependency on chai-as-promised and added BigNumber support in PausableCrowdsale tests

* reindent solidity with 4 spaces

* add missing view modifier in _preValidatePurchase

* convert assertRevert to new shoulFail helper

* add new setup helper

* use expectEvent

* convert to assert to chai should style

* add description to beforeEach blocks

* extract common step to beforeEach

* improve documentation

* revert inheritance error

* move PausableCrowdsale into crowdsale/validation

* make documentation more specific

* put whitespace in line with convention

* improve test suite account names

* undo beforeEach descriptions

* simplify tests

* fix transaction senders to be the anyone account

* make transaction senders more explicit

* remove mocha only

* Now only swapping when needed.

* Removed _addTokenTo and _removeTokenFrom

* Removed removeTokenFrom test.

* Added tests for ERC721 _mint and _burn

* _burn now uses the same swap and pop mechanism as _removeFromOwner

* Gas optimization on burn

* remove note that was fixed in #1526

* add build script

* add prepack script

* remove custom compilation steps

* Added WhitelisterRole.

* Added WhitelisteeRole and WhitelistedCrowdsale.

* Added WhitelistedCrowdsale tests.

* Whitelisters can now remove Whitelistees.

* PublicRole.behavior now supports a manager account, added Whitelistee tests.

* Rephrased tests, added test for whitelistees doing invalid purchases.

* Fixed linter error.

* Fixed typos

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Working around JS quirks

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Update PublicRole.behavior.js

* Renamed WhitelisteeRole to WhitelistedRole.

* Renamed WhitelistedCrowdsale to WhitelistCrowdsale.

* Now using the new test helper.

* Added basic documentation.

* Deprecated ERC721._burn(address, uint256)

* Added missing natspec comment.

* Fixed unnecessary dependency of RefundableCrowdsaleImpl on ERC20Mintable.

* Added PostDeliveryRefundableCrowdsale.

* Renamed to RefundablePostDeliveryCrowdsale.

* Added deprecation warning.

* Added _transferToken.

* _transferFrom is now usable by derived contracts, abstracted away enumerable behavior.

* Removed unnecesary check from _clearApprovals

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1205

* minor change

* suggested changes

* reviewed changes

* final update

* signing prefix added

* Minor improvement

* Tests changed

* Successfully tested

* Minor improvements

* Minor improvements

* Revert "Dangling commas are now required. (#1359)"

This reverts commit a6889776.

* updates

* fixes #1404

* approve failing test

* suggested changes done

* ISafeERC20 removed

* conflict fixes

* fixes #1512

* Update test/token/ERC721/ERC721Full.test.js

Co-Authored-By: Aniket-Engg <30843294+Aniket-Engg@users.noreply.github.com>

* Added explicity pify dep, deprecating web3.eth.

* Dropped promisify in favor of pify.

* make provider creation lazy

* change getter for function

* remove unused networks from truffle config

* remove unused dotenv package

* remove truffle-hdwallet-provider dependency

* install ethereumjs-util

* replace sha3 with keccak256 for ethereumjs-util v6

* Renamed sendTransaction to send, improved API.

* Added send tests.

* Now using promisified web3

* Added advanceBlock to time, moved tests around.

* Removed the standalone advanceBlock.

* Removed the 'id' field

* Fixed linter error.

* Removed the 'latest' test, since it only works if time hasn't been fast-forwarded.

* Removed .only directive.

* transferFrom now emits an Approval event, indicating the updated allowance.

* Updated burnFrom to also emit Approval.

* Added notices about the extra Approval events.

* Added time tests.

* Minor improvements.

* Added inTransaction tests.

* Added expectEvent.inConstructor.

* Changed inTransaction, removed decodeLogs.

* Flipped comparison to improve the error message.

* Improved expectEvent tests.

* Migrated tests to use expectEvent.

* Added roles constructor tests.

* Fixed linter errors.

* Made lodash a dev dependency.

* Added more inLogs tests.

* Update expectEvent.test.js

* Removed lodash.

* Moved role constructor tests to public role behavior.

* Revert "Flipped comparison to improve the error message."

This reverts commit 438c57833d997d2972a7730180a266bc3c6a87c5.

* Replaced chai-as-promised with shouldFail.

* Added ether tests.

* Added shouldFail base function and tests.

* Updated test descriptions.

* Reduced gas limit on out-of-gas tests.

* Rolled back Travis stages

* Rolled back the rolled-back changes.

* Renamed jobs, coverage can no longer fail.

* Cleaned up the yaml file a bit.

* Updated coveralls badge.

* Added balanceDifference tests.

* Added balanceDifference tests.

* Now using balanceDifference in all (most) tests.

* Fixed typo.

* Updated code style to 4 spaces and 120 max characters per line.

* Update contracts/token/ERC721/ERC721Pausable.sol

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Update contracts/token/ERC721/IERC721.sol

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

Small change in test description, should be "allows to approve..." instead of "allow to transfer..." in approve section, where test actualy try to approve, not to transfer.