Renamed composer.dist.json to a more standard composer.json.dist

See : http://stackoverflow.com/questions/16843080/what-does-dist-used-as-an-extension-of-some-source-code-file-means
Added forgotton file and readme update
Updated travis conf
Merge pull request #462 from purplefish32/renamecomposerjson

Renamed composer.dist.json to a more standard composer.json.dist
Added required extension