images optimized
bug 968311 - Put Gallery App in scrollable background color
Bug 968478. Put scrollable opaque layer in calendar app
Merge pull request #16124 from rnowm/img-compression

images optimized
Bug 970274 - Disable test_persona_app.py for Hamachi devices a=testonly r=me
Merge pull request #16126 from changm/bug968311

bug 968311 - Put Gallery App in scrollable background color. r=:21
Merge pull request #16127 from changm/bug968478

Bug 968478. Put scrollable opaque layer in calendar app. r=21