Fixes up license requirements for podspec

- License has to be in a separate file to remove lint warning
Merge pull request #44 from zachgersh/pull-request-license

Fixes up license requirements for podspec
Minor update to readme.

Turns out I have no idea what year it is.
Can query current popover controller
UIPopoverController stub can be dismissed, queried for visibility, and queried for arrow direction. Added test coverage of all UIPopoverController methods.
Fixed Spec errors when run against iOS 6 (travis runs iOS 6, apparently)
Can reset currentPopoverController.
Add specs for UIActionSheet stubs and extensions
Wrote specs assuming ARC, add compiler flag to file to actually build with ARC
Fix target membership
Current popover is reset in CedarHooks +afterEach
Updates podspec to fix lint errors

- This should be revisited once the project is reorganized a bit