Changes in InterfaceHandler to deal with multiline natspec
Changes in InterfaceHandler to deal with multiline natspec

- Also now Solidity scanner considers Carriage Return as whitespace
- Tests for Natspec generation with the new multiline comments

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