Bug 517765 - Add 'make source-package' support into js/src. r=sstangl, a=bajaj
DONTBUILD CLOSED TREE
Bug 517765 - Followup (because Windows hg is Dumb about file permissions): chmod 0755 js/src/make-source-package.sh.  r=sstangl, a=bajaj in a CLOSED TREE