Bug 998299 - Add Neo layout

[Neo](http://www.neo-layout.org/) is another layout for keyboards.

Since Neo request at least 11 keys in each line this is a adaptation
of it to mobile devices (a adaptation to Android is available at
https://play.google.com/store/apps/details?id=com.anysoftkeyboard.languagepack.neo2&hl=en).
Bug 998263 - [Tarako][Gallery][Video]Image/Video file size is incorrect
Bug 1009368 - Configure keyboard correctly
Bug 1010394 - Refresh the items when entering the carrier panel
Bug 1012520 - Remove mCalls from the mock mozSettings impl
Bug 1012627 - Use the "Dot" reporter on Travis r=yurenju
Bug 1012545 - Prevent a fluffing/rendering issue on the add-contact-button.
Bug 1003060 - [VR][Messaging] Empty circle to the right in messages without recipient
Bug 992226 - Awesomescreen leaks blob URLs for favicons
Bug 986506 - [system] Offline warning when downloading updates looks broken with longer text
Bug 1000340 - Follow-up of 992568 - Remove obsolete codes to launch video app for RTSP
Bug 1010990 - (gaia-buttons) Create gaia-buttons web component
Bug 1008039 - [Flame][Camera][1.4][2.0] Tapping the 'switch camera' button 4 times rapidly results in black viewfinder
Bug 1003979 - [B2G][Open_C][Dialer]Contact picture does not appear in the call log
Bug 910182 -[CONTACTS] Export functionality: add missing cancel export for any type of export
Bug 1011087 - Hide the keyboard at the beginning of an edge gesture.
Bug 1009963 - Making sure the fullscreen status bar panel doesn't steal focus from the active app.
Bug 1012692 - (vertical-homescreen) Add option to change the wallpaper
Merge pull request #19399 from EricRahm/bug_992226

Bug 992226 - Awesomescreen leaks blob URLs for favicons r=benfrancis
Bug 1013085 - change gaia-header folder name r=yor r=wilsonpage