Added a feature file type detection.
Added a feature file type detection.

yuya-takeyama/the_platinum_searcher,drmohundro/the_platinum_searcher,cmars/tools,cmars/tools,tw4452852/the_platinum_searcher,cmars/tools,monochromegane/the_platinum_searcher,aeruder/the_platinum_searcher,syohex/the_platinum_searcher,cmars/tools,thomasf/the_platinum_searcher,DaSea/the_platinum_searcher