DraggableGridView : Various fixes

This patchset tries to address the following issues :
  - Touch was too sensitive, hard to long click
  - Overscroll/bounce was unecessary
  - Unecessary view updates being invoked every 25ms

Change-Id: I34e02d541a4d4a2299fb609aa600102b127534ff
Settings: Do not show the Quick pulldown option on Tablets

Change-Id: Ibc6ff5b334fc253da102e203fac781f80e079896