Properly configure component in composer.json

Provides correct "authors" property, and more importantly, adds the needed properties for use with the Composer component-installer.  

One note: I've chosen to include only the base moment.js in the default script build, and load the other, larger, files as alternative files that can be loaded if desired.  I think this makes the most sense, as there will be more projects that just want to use one or a few languages and don't want to load the entire language pack. I've also included the individual language files, so one can
  require(["moment", "moment/lang/fr"], ...);
for instance, to load individual languages.