Modify way that gem reconize multiparts cards - before makes many errors
Fix for Rails 4.0
Make card name search case-insensitive (for cards such as Will-O'-The-Wisp/Will-o'-The-Wisp)
Change SetExtractor source to find more cards (e.g. multiple artwork versions in the same set)
Gatherer no longer lists &part= URL's, so we have to get the split card information from the same page
Skip update for cards that exist
Merge branch 'topic/regexcase'
Merge branch 'topic/setsource'
Merge branch 'topic/splitcards'
Merge branch 'topic/skipexisting'