Update AbstractActionSheetPicker.m

Fix UIActionSheet popping into view and only scrolling the last 40 pixels or so.  Fix taken from http://stackoverflow.com/a/2533980/645314
Merge pull request #81 from GitUser03/patch-1

Update AbstractActionSheetPicker.m
Update README.md
Update README.md
Update README.md
Update README.md
Merge branch 'master' into tzcal