Updated project settings per Xcode warning (switched to LLDB debugger).
Changed UIBarStyle enum to UIActionSheetStyle enum per Xcode warning.
Bug 1: Created NSUserDefaults key ("BrainTeaserViewSort") with values "Difficult", "Easy", "Popular", "Date", and "Default". Set sorting to be performed immediately after the XML data source is finished loading.
Merge pull request #7 from chead/develop

Saving sort