* 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.