Moving all Interface and Documentation functionality to own class
Moving all Interface and Documentation functionality to own class

- Creating the Interface Handler class which will take care of the
  parsing of Natspec comments and of interfacing with and outputing to
  JSON files.

- Will also handle the ABI interface creation

chriseth/solidity,ruchevits/solidity,vaporry/solidity,gluk256/solidity,ruchevits/solidity,debris/solidity,ethers/solidity,shahankhatch/solidity,LefterisJP/solidity,chriseth/solidity-doc-test,LianaHus/solidity,douglas-larocca/solidity,arkpar/solidity,ruchevits/solidity,ruchevits/solidity