* Improve encapsulation on ERC165
* Improve encapsulation on ERC20
* Improve encapsulation on ERC721
* Add tests, use standard getters
* fix tests
* Fix lint
* move interface ids to implementation contracts
* Do not prefix getters
* rename ERC20 to IERC20
* move ERC20.sol to IERC20.sol
* rename StandardToken to ERC20
* rename StandardTokenMock to ERC20Mock
* move StandardToken.sol to ERC20.sol, likewise test and mock files
* rename MintableToken to ERC20Mintable
* move MintableToken.sol to ERC20Mintable.sol, likewise test and mock files
* rename BurnableToken to ERC20Burnable
* move BurnableToken.sol to ERC20Burnable.sol, likewise for related files
* rename CappedToken to ERC20Capped
* move CappedToken.sol to ERC20Capped.sol, likewise for related files
* rename PausableToken to ERC20Pausable
* move PausableToken.sol to ERC20Pausable.sol, likewise for related files
* rename DetailedERC20 to ERC20Detailed
* move DetailedERC20.sol to ERC20Detailed.sol, likewise for related files
* rename ERC721 to IERC721, and likewise for other related interfaces
* move ERC721.sol to IERC721.sol, likewise for other 721 interfaces
* rename ERC721Token to ERC721
* move ERC721Token.sol to ERC721.sol, likewise for related files
* rename ERC721BasicToken to ERC721Basic
* move ERC721BasicToken.sol to ERC721Basic.sol, likewise for related files
* rename ERC721PausableToken to ERC721Pausable
* move ERC721PausableToken.sol to ERC721Pausable.sol
* rename ERC165 to IERC165
* move ERC165.sol to IERC165.sol
* amend comment that ERC20 is based on FirstBlood
* fix comments mentioning IERC721Receiver
* Consolidted ERC20 Interface and Implementation Files
* Fixed CanReclaimToken's tests to use StandardTokenMock instead of BasicTokenMock
* Changed token's variable type in TokenTimelock to ERC20
* Merged the StandardBurnableToken with BurnableToken since it now inherits from StandardToken; Fixed TokenTimelock so it uses SafeERC20 for ERC20
* Fixed variable type for _token in TokenTimelock constructor
* Fixed linting warning in BurnableToken
* Added back burnFrom tests.
* fix: clean up solium linting errors
* fix: make various contracts natspec compliant
* fix: this.balance deprecated; convert to address(this).balance
* fix: contract.call deprecated and switch to gasleft()
* fix: ignore empty block rule project-wide
* fix: add ignore cases for the rest of the linting warnings
* Update to ganache-cli v6.1.0 and truffle v4.1.0
* Update to stable version of ganache-cli
* fix: update event emission warning
- Fix event emission warnings for solidity 4.21 after truffle has been
updated to use this version
* fix pr review comments
* update to truffle v4.1.5
* update package-lock
* add additional emit keywords
* update solidity-coverage to 0.4.15
* update to solium 1.1.6
* fix MerkleProof coverage analysis by testing through wrapper
* change version pragma to ^0.4.21
* fix solium linting errors
