Add Travis configuration
displays invalid char during base64 decoding instead of sentinel

also makes base64lookup Uint8 and removes the need to add 1 for the
decoding
cosmetic changes
Displays invalid char during base64 decoding..., take II
Merge pull request #11 from michele-zaffalon/master

base64 decoding displays sentinel instead of incorrect character
Merge pull request #9 from analyzere/travis-for-canonical-repo

Add Travis configuration
Merge remote-tracking branch 'dcjones/master'