Transfer function returns false when wrapped in a require statement

[wilhempujar]

BUG

While having other smart contracts communicate with the DSLA token contract, we noticed they might run into issues when wrapping the DSLA token contract transfer function in a require statement like the following:

function transferTokens(_to)
  require(dsla.transfer(_to, amount));
end

FIX

After investigation, it appears that the transfer function of the DSLA token contract always returns false because it presently lacks a return statement, an issue simular to the one extensively described in this article.

To ensure full compatibility of the DSLA token contract with other smart contracts, we will apply a patch to the ropsten and mainnet contracts accordingly, using ZeppellinOS patching capabilities.