Updated composer license and keywords
Updated composer license and keywords

Updated composer.json with a properly defined license and new keywords.

localheinz/Stash,tedious/Stash,andrerom/Stash,alawnchen/Stash,theUniC/Stash,jaredtking/Stash,alawnchen/Stash,AndrewCarterUK/Stash,jaredtking/Stash,graphis/Stash,AndrewCarterUK/Stash,theUniC/Stash,csburton/Stash,andrerom/Stash,bankiru/Stash,csburton/Stash,graphis/Stash,localheinz/Stash,bankiru/Stash,tedious/Stash