disambiguated between actual video files and flash movies
disambiguated between actual video files and flash movies

* introduced new query methods video? and flash?
* left old concept of “movie” intact to retain backwards-compatibility
* introduced term “kind” for the short handles for content-types, refactored a little

radiant/radiant-clipped-extension,radiant/radiant-clipped-extension,radiant/radiant-clipped-extension,saturnflyer/paperclipped,GarPit/radiant-clipped-extension,kbingman/paperclipped,radiant/radiant-clipped-extension,GarPit/radiant-clipped-extension,kbingman/paperclipped