Increase themeability of Clock, Signal, Wifi in statusbar

Now fixed negative numbers

Patch-set 2: Forgot cleanup log.

Patch-set 5: Compatibility with alt. signal layout

Change-Id: I6458998c37e7d9c07d389d851647bb98a15797f9
Signed-off-by: kecinzer <kecinzer@gmail.com>
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Conflicts:
	packages/SystemUI/res/values/styles.xml
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java
Unregister content observer for wifitext and signaltext
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Change-Id: I28067bc444d9d96deba968cb31869fd899e1f258