Stats: Refs #874. Retains the selection under Visitors and Views tab when rotated.

The selection wasn't being saved and persisted when the fragment was destroyed and re-created.
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into develop
Merge branch 'develop' of https://github.com/wordpress-mobile/WordPress-Android into develop
Stats: Refs #874. Using setRetainInstance(true) retains the selection under Visitors and Views tab, when rotated.
new release-checks.sh test to detect translated lang on Glotpress not present locally
update update-translations.sh script to use exported-language-codes.csv
fix #1249
pull zh-tw from glotpress to zh-rTW and zh-rHK locally
Merge branch 'develop' into feature/language-pull-script
remove Config.java generation, use BuildConfig.java instead
Add support for samsung multi-window with default settings
rename local.properties-example -> gradle.properties-example
use BuildConfig instead of Config
update readme with instructions to generate local.properties and init gradle.properties
remove retired build files
remove unused file: proguard-project.txt
The config wasn't working correctly, that's why we firt removed proguard from gradle.
If we want to re-introduce it, we'll have to correct it.
remove unused mCurrentSslCertificatesForcedTrusted and fix method name UrlUtils.addHttpProcolIfNeeded
code style
fix #1146: on third invalid username/password error, a new message is presented to the user with a hint for self hosted users
use the correct nux_add_selfhosted_blog string