Display message instead of progressbar when no loadable

This changes the endless ProgressBar in the right pane to a (generic)
TextView that shows "Select a thread".
Use getActivity() in ThreadFragment, fix crash on restore state.
Merge branch 'vaguelyasian-empty_thread' into dev
Update gradle.
Renaming recaptcha_response_field to g-recaptcha-response fixes captchas (temp fix)
Update to v1.2.3
Release v1.2.3
Release v1.2.3 with updated versionCode
Merge branch 'dev'

Conflicts:
	Clover/build.gradle
	Clover/gradle/wrapper/gradle-wrapper.properties
Update for Android Studio 1.0
Update Ion to 2.0.1
Start of Material redesign.
Fix dropdown colors and change some toolbar icons
Fix colors, change pin icon
Change the pin icon to a bookmark icon
Change toolbar height to fix landscape height
It still has some problems though with rotating.
See issue https://code.google.com/p/android/issues/detail?id=77874
Make all activities use a toolbar.
Updated the watch/pass screen to use a top switch bar.
Removed up navigation stuff.