Base: Network traffic (1/2)

Also includes
http://gerrit.aokp.co/#/c/13356/
http://gerrit.aokp.co/#/c/13360/

@fusionjack:
* Format speed text using Formatter.formatFileSize
* Set speed text to empty if speed below 1 KB
* Don't do unnecessary things if network stats is disabled
* Address appropriate task for each intent
* SettingsObserver should only observe settings part
* Option to show/hide network speed arrow icons

Change-Id: Ie81c7c61c84f07eab58a320601fa76869821663f
[1/2] Frameworks: Doze (ambient display) timeout

Change-Id: I0eb230020da9a306e089b58db9d48b18c9743c0f
Frameworks: port SlimSeekBarPreference to SlimLP

Patchset: materialize slider preference
Change-Id: I84c16cee9162a3fd53c0b62398a2ca03415ce974