Option to hide network speed indicator when there is no traffic (1/2)

Change-Id: Ia65b50be986abe4a7d9c1e731d08f8c0ab8e2ab4

Conflicts:
	res/values/cm_strings.xml
	src/com/android/settings/cyanogenmod/StatusBar.java

Conflicts:
	res/values-de/ck_strings.xml
	res/values/ck_strings.xml
	res/xml/status_bar.xml
	src/com/android/settings/cyanogenmod/StatusBar.java