Remove return values of pause() and unpause() of Pausable

Add complex crowdsale example #331

Move examples to separate directory

Upgrade truffle to 3.4.6

Remove MultisigWallet in favor of ConsenSys/MultiSigWallet

Fix test script cleanup and portability

Remove coveralls token

because when we interrupt the tests via ^C, the signal also kills the
background process

fix testing error throwing

Fix/ownable error - Silent transferOwnership Failure

Minor coverage maintenance

Tests refactoring and typo fixes

Test if unpause prevents events allowed in paused state

Refactor test script

- fix status code (script exited with success even with failing tests)
- clean up and explain things