The constant keyword is being used in functions, this will be deprecated at the next breaking release

[matt-lough]

constant should not be used for functions, it is going to be invalid at the next breaking release of solidity. (ethereum/solidity#992)

Some of your functions have already been changed to view or pure but this is no consistent.

More info: https://ethereum.stackexchange.com/questions/25200/solidity-what-is-the-difference-between-view-and-constant

[thesved]

thesved@641e021

I left the wallet untouched, since it is a well-tested consensys multisig wallet, which will hold all the contributions, and I don't feel comfortable to change it.

[OperationNine]

Yes this is understandable