separate the completion and selected actions, if the user wants to do something just on Done button and not on selection change. Also add a MMspaceBottom option, to allow the use of a bottom offset, in case the user need to offset a bottom bar (such as tabbar).
fix to the component can be used on iPad also
Merge branch 'master' of https://github.com/iferrera/MMPickerView

Conflicts:
	MMPickerView/MMPickerView.m