Improving pie control's user interaction

User feedback showed that it is sometimes difficult to interact
with pie controls. This commit adds some tweaks to how pie
controls react on user touch events.

This changes:
* Pie trigger on LEFT and RIGHT are now more forgiving in the
  initial phase of a swipe. (This should reduce problems when
  trying to activate the pie with a thumb.)
* Pie items are now more sloppy when it comes to focus.

Patch Set #2:
* Removed sloppy focus.

Change-Id: Ib21556ed7f7ff9c6cdbcd1760e94a17c8534706a
Adapt navigation bar's long press behaviour for pie controls

This commit brings the navigation bar long press behaviour to
pie controls.

Two things will be considered for long press:
* Long press on HOME will open Google Now.
* Long press on BACK will kill an application if enabled within
  the debug options.

Patch Set #2:
* Jacob's colours

Patch Set #3:
* More blueish colours
* Using a longer time out for long press
  (getLongPressTimeout() * 2)
* Moved killForegroundAppication() around

Patch Set #5:
* Shortened long press time out a bit
* Adjust time for info shade dynamically

Change-Id: I8cfa87a5be0678f0452011d85d427439d7cf31e9

Conflicts:

	packages/SystemUI/src/com/android/systemui/statusbar/policy/PieController.java