HALO Style revamp

- speech bubbles are centered
- number batches are roundand simplified, same color as in g+
- markers appear as dots above the bubble
- hiding and dimissing triggers text hints
- couple of bugfixes

WARNING: some of the drawables are good for xhdpi only for now and must
be scaled down for the other resolutions

Change-Id: Ib656664f6f8c42b747df18d65d1e3fb40cb7480c

Conflicts:
	packages/SystemUI/res/drawable-hdpi/halo_pulse1.png
	packages/SystemUI/res/drawable-mdpi/halo_number.9.png
	packages/SystemUI/res/drawable-mdpi/halo_pulse1.png
	packages/SystemUI/res/drawable-nodpi/bubble_black_l.9.png
	packages/SystemUI/res/drawable-nodpi/bubble_black_r.9.png
	packages/SystemUI/res/drawable-xhdpi/halo_number.9.png
	packages/SystemUI/res/drawable-xhdpi/halo_pulse1.png
	packages/SystemUI/res/layout/halo_speech.xml
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Conflicts:

	packages/SystemUI/res/drawable-hdpi/halo_pulse1.png
	packages/SystemUI/res/drawable-mdpi/halo_number.9.png
	packages/SystemUI/res/drawable-mdpi/halo_pulse1.png
	packages/SystemUI/res/drawable-xhdpi/halo_number.9.png
	packages/SystemUI/res/drawable-xhdpi/halo_pulse1.png
	packages/SystemUI/res/values/strings.xml

Conflicts:

	packages/SystemUI/res/values/strings.xml