Fix #140: VIPManagedObject getSorted: could return nil

NSMutableArray addObject: method cannot take a nil argument
Issue surfaced in ContestDetailsViewController UpdateUI when
setting Contests via the getSorted: method

Test updated
Add missing Social Media links storyboard string to es.lproj

The social media links storyboard text was erroneously an
attributed string, which are not picked up by the storyboard
string extraction tools. Reset to plain string and updated the
es.lproj VIPStoryboard.strings file using the update strings
script in Base.lproj
Fix #138: Specify scheme http/https for in-app browser links

Could continue to further refine this check, although the fallback
of displaying the URL in the table cell isn't terrible.
Fix compiler cast warning in Candidate Model
Bump app version to 1.1.2