Bug 939971 - [SMS] SMS are cut if you switch App while writing your text message r=schung

* Never add an empty text in the content array
* Remove old code that is not used anymore
Bug 866907: Settings UI Implementation.

- NFC UI enable/disable
- Airplane mode implementation.
bug 907155 - [System] Wake phone before shutdown to prevent blocking powerOff
Merge pull request #13469 from rexboy7/fix-bug907155

bug 907155 - [System] Wake phone before shutdown to prevent blocking powerOff r=alive
Bug 940802 - [UITest] style fix
Merge pull request #13859 from MBRSL/bug-940802-style

Bug 940802 - [UITest] style fix, r=gasolin
Bug 883767 - [Email] Unsupported encoding in some email makes the email client explode. r=asuth

propagate https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/262
Merge pull request #13850 from svic/rebase-master-41c3fd86-SettingsUI

Bug 866907: Settings UI Implementation, r=evelyn
Merge pull request #13864 from asutherland/encoding-explosions

Bug 883767 - [Email] Unsupported encoding in some email makes the email client explode. r=asuth
Merge pull request #13846 from julienw/939971-sms-are-cut

Bug 939971 - [SMS] SMS are cut if you switch App while writing your text...