Add option to Restart SystemUI to DevSettings

Change-Id: I1dd55510a878198f245ff90c011717ac5fb65f93

Conflicts:
	res/values/bliss_strings.xml
	src/com/android/settings/DevelopmentSettings.java
Show wifi tab by default in Data Usage

On devices with cellular radios, the wifi tab is hidden by default.
This makes it visible.

Change-Id: Ie2f3a90c241e1e263e4b62f1a2995e001ae94328