Added podspec.
Added podspec.

seivan/SHControlBlocks,seivan/SHActionSheetBlocks,seivan/SHBarButtonItemBlocks,seivan/SHAlertViewBlocks,seivan/SHGestureRecognizerBlocks,seivan/SHBarButtonItemBlocks,seivan/SHActionSheetBlocks,seivan/SHControlBlocks,seivan/SHAlertViewBlocks,seivan/SHAlertViewBlocks,seivan/SHBarButtonItemBlocks,seivan/SHActionSheetBlocks,seivan/SHControlBlocks,seivan/SHGestureRecognizerBlocks,seivan/SHGestureRecognizerBlocks