Changelog

• Add external audit report to repo.
• Minor improvements to Destructible.
• Revert to usig npm as preferred installation method, as ethpm is still immature.
• Add solidity-coverage
• Add natspec documentation
• Add revokability and burnablity options to VestedToken and general refactor and optimizations

Security

• Add fix for the approve() mitigation.
• Protect transferFrom against short hand attack.
• Fix attack on VestedToken#grantVestedTokens()

Thanks to @misteraverin, @miohtama, @izqui, @cgewecke, @maurelian, @JGcarv and @DavidKnott for your contributions to this release!