Bug 828843 - Remove feedback app from release builds. r=ochameau
(cherry picked from commit 482f18f13924be94a9059e8533a9d2fff423fb76)
bug 833945 - provide packaged and hosted app stubs to dogfooders; r=fabrice
(cherry picked from commit 51b68335c5756e4bd68ff97c23e871ad96218fce)

Conflicts:
	build/utils.js
Merge pull request #7794 from mykmelez/v1-train-stub-apps

bug 833945 - provide packaged and hosted app stubs to dogfooders; r=fabrice