changed deployment target and version

* introduced by #4
enabled ARC

* removed mem related calls
* upgraded autorelease pool
* removed ivar for IBOutlet
* fixes #4
Merge branch 'master' into 4_ARC

* master:
  README section for ARC
Merge branch 'master' into 4_ARC

* master:
  updated podspec
  Basic spec file, the version and tag/commit for the build will need to be updated.
  no not retain delegate
  Added description for fractional images #9
  adopted description
  dropping ios3 support
  minor cleanup of #7
  Unused method removed
  Fractional rating support
  added zucchini reference
  Added UI testing with zucchini
  Added accessibility labels for individual stars
  moved link to main repo
  Revert "moved sample screenshot to Downloads area"
  moved sample screenshot to Downloads area
  added ability to set custom images for single stars and updated the demo project with this setting
  added ability to set custom images for single stars and updated the demo project with this setting
  updated for xcode 4

Conflicts:
	DLStarRating/DLStarRatingControl.h
	DLStarRating/DLStarRatingControl.m
	DLStarRatingDemo/Classes/DLStarRatingDemoViewController.m
	DLStarRatingDemo/DLStarRatingDemo.xcodeproj/project.pbxproj
Updated podspec for ARC
Merge branch '4_ARC'