added limit attribute to assets:each, also removed build_regexp_for method (included in StandardTags)
added limit attribute to assets:each, also removed build_regexp_for method (included in StandardTags)

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