Updated code references to bitcoin, with dogecoin.
Corrected name of generated binaries to dogecoind and dogecoin-qt.
Update binary names to match dogecoind and dogecoin-qt.
Completed renaming core binaries to dogecoind, dogecoin-qt and dogecoin-cli as appropriate.
Merge pull request #370 from rnicoll/1.7-dev-code_references

Update binary names to be doge-applicable
Replaced references to Bitcoin with Dogecoin in UI code.