finally: caching. one config file per action, definitions can be specific to one or more request-method, each definition can contain settings specific to one or more output types, groups (like in smarty, multiple sources like string, locale, request param etc), cache TTL ('2 days 4 hours'), caching can be controlled on a per layer level, slots can be included in the cache, action attribs, template vars and request attribs (yes, with namespace) can be restored, restrictable to certain views, closes #78. also did some minor fixes here and there, added slots to sample app.
