first test to add a gradle local dependency
remove android-passcodelock for now
use android-passcodelock as a local dependency
use maven central repo for some old packages
Merge branch 'develop' into issue/1423-gradle-local-dependencies

Conflicts:
	build.gradle
use mixpanel-android provided by maven central
add git submodule commands to the readme
initial commit of CONTRIBUTING.md
initial commit of CODESTYLE.md
add translation contrib
_force_ contributors to branch from develop
Add helpshift _contact us_ button in NUX help menu
send notificaton registration id to helpshift in order to enable PN messaging with helpshift
Html is now removed from post titles
Don't pass the savedInstanceState to super for NotificationsActivity. Fixes #1519
fix #1533: call gradle clean after th gradle test build
Fix location strings to match Android standards

h/t maxme

fixes #1524
Use a custom LinkMovementMethod class that handles Stats links.
Fix a leaked window issue.
Fix style issues