Bug 938931 - [FTU] Fix checkbox regressions from bug #914892
Bug 939149 - [Action Icons - FM Radio] Remove shadows from action icons
Bug 939148 - [Action Icons - Calendar] Remove shadows from action icons
Bug 939729 - With httpd.js we sometimes don't get the most recent version of the file r=vingtetun

This patch:
* makes all files expire immediately, forcing a revalidation by Firefox
* implements conditional requests with Last-Modified-Since
Bug 937630 - All you need is ... smooth unlock transition
Merge pull request #13781 from pivanov/bug-939149

Bug 939149 - [Action Icons - FM Radio] Remove shadows from action icons
Bug 933561 - App does not come to foreground if user quickly toggles between home screen and app
Bug 939720 - Failure in test_ftu_skip_tour
Merge pull request #13795 from timdream/lockscreen-unlock-transition2

Bug 937630 - All you need is ... smooth unlock transition, r=vingtetun
Merge pull request #13796 from viorelaioia/bug_939720

Bug 939720 - Failure in test_ftu_skip_tour
Bug 939771 - xfail test_setup_basic_gmail.py
Merge pull request #13798 from bebef1987/xfail_email

Bug 939771 - xfail test_setup_basic_gmail.py
Merge pull request #13793 from julienw/add-expiration-and-conditional-content-logic-in-httpd-js

Bug 939729 - With httpd.js we sometimes don't get the most recent versio...
Bug 939722 - Xfail test_cost_control_data_alert_mobile
Merge pull request #13800 from bebef1987/xfail_cost

Bug 939722 - Xfail test_cost_control_data_alert_mobile
Revert "Bug 937630 - All you need is ... smooth unlock transition" for bustage in Gaia Unit Tests

This reverts commit 68fc2b25ce4648ca70be8efc589b81cb0bab4465.
Merge pull request #13789 from crdlc/bug-933561

Bug 933561 - App does not come to foreground if user quickly toggles bet...
Bug 924454 - Make the busy tone longer and clearer r=etienne
Merge pull request #13782 from pivanov/bug-939148

Bug 939148 - [Action Icons - Calendar] Remove shadows from action icons r=kgrandon
Merge pull request #13762 from eeejay/bug-938931

Bug 938931 - [FTU] Fix checkbox regressions from bug #914892. r=fcampo