Merge branch 'develop'

* develop: (31 commits)
  Bumped build gradle
  Renamed get adapter to getbaseadapter to fix issues with operations on the original adapter
  Updated to gradle 0.7
  Updated pos index for click listener
  Fixed issues with select states
  Adjusted set background call to use setBackgroundDrawable to be compatible with older API versions
  Updated grid wrapper to use list selector attribute from styles
  Added long click listener support and added proxy getadapter/getcount calls
  Fixed issue with rounding
  Fixed issue with standard columns not displaying items correctly
  Added fallback if column spec isn’t being used
  Removed gradle references and updated root build gradle
  Added additional multiple column example
  Added column spec calculator for custom column counts per row
  Implemented grid adapter in example
  Added basic call for column count
  Added custom grid adapter class
  Updated attar reference
  Added additional method proxy overrides
  Refactored column count name
  ...
Updated build gradle
Updated to gradle 0.9
Merge branch 'master' into develop

* master:
  Updated to gradle 0.9
  Updated build gradle