Port unmerged notification changes from jb-dev to jb-mr1-dev

Bug 7150006

Single finger notification expansion.

If you liked these changes...

  Change Ie4e79aa5
  Change I8a6f8606
  Change I824937e9
  Change I957b6d50

You'll love this one!

Conflicts:
	packages/SystemUI/res/values/config.xml
	packages/SystemUI/res/values/dimens.xml

Fix notification gestures.

Broken by recent changes to ScaleGestureDetector, which we
were using incorrectly.

Conflicts:
	packages/SystemUI/res/values/config.xml
	packages/SystemUI/res/values/dimens.xml

Change-Id: Ie534c5b2d320296531a36a9b1c22f9dd6901e0b8