Stop using shallow clone for Git repositories
Stop using shallow clone for Git repositories

It doesn't allow for comparisons between two revisions, needed for
syncing only changed files (bug 1214411).

participedia/pontoon,mastizada/pontoon,mathjazz/pontoon,mathjazz/pontoon,jotes/pontoon,mozilla/pontoon,jotes/pontoon,mozilla/pontoon,participedia/pontoon,mathjazz/pontoon,mastizada/pontoon,participedia/pontoon,mathjazz/pontoon,mastizada/pontoon,mozilla/pontoon,participedia/pontoon,mastizada/pontoon,mathjazz/pontoon,jotes/pontoon,mozilla/pontoon,mozilla/pontoon,jotes/pontoon