Merge pull request #21 from remind101/master

Make windowLevel for form sheet and form sheet background less than the window level for the keyboard.
Issue #14, Issue #15, Issue #18, Fix blur background
Unnecessary code cleanup
Issue #17 Form sheet move to top when UIKeyboard appear
Podspec update
Fix centering form sheet controller
Fix landscapeTopInset and portraitTopInset for iOS7
Refactor some stuff
Add background image view observer
Add license note
Fix rotation on dynamic blur
Merge branch 'master' of https://github.com/m1entus/MZFormSheetController
Fix landscape presentation bug
Variable name change
form sheet window access
Form sheet window is touch transparent
Update readme
Fix form sheet window transparent touch
Add transparent touch setter