Network Meter controls added 2/2.

Added network meter controls, borrowed from OmniROM and modified slightly to allow custom colours.

1/2 can be found in Settings

Changes to be committed:
	modified:   core/java/android/provider/Settings.java
	new file:   packages/SystemUI/res/drawable-hdpi/stat_sys_network_traffic_down.png
	new file:   packages/SystemUI/res/drawable-hdpi/stat_sys_network_traffic_up.png
	new file:   packages/SystemUI/res/drawable-hdpi/stat_sys_network_traffic_updown.png
	new file:   packages/SystemUI/res/drawable-mdpi/stat_sys_network_traffic_down.png
	new file:   packages/SystemUI/res/drawable-mdpi/stat_sys_network_traffic_up.png
	new file:   packages/SystemUI/res/drawable-mdpi/stat_sys_network_traffic_updown.png
	new file:   packages/SystemUI/res/drawable-xhdpi/stat_sys_network_traffic_down.png
	new file:   packages/SystemUI/res/drawable-xhdpi/stat_sys_network_traffic_up.png
	new file:   packages/SystemUI/res/drawable-xhdpi/stat_sys_network_traffic_updown.png
	new file:   packages/SystemUI/res/drawable-xxhdpi/stat_sys_network_traffic_down.png
	new file:   packages/SystemUI/res/drawable-xxhdpi/stat_sys_network_traffic_up.png
	new file:   packages/SystemUI/res/drawable-xxhdpi/stat_sys_network_traffic_updown.png
	modified:   packages/SystemUI/res/layout/status_bar.xml
	modified:   packages/SystemUI/res/values/dimens.xml
	modified:   packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java
	new file:   packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkTraffic.java