Include resource URI and sanitize instance name when converting Resource object to string
Fixed: Use string instead of json serialization, because arguments are most likely classes (such as heimdall.resources.Resource)
MediaInfo supports curl and libmms, so attempt all URIs. Also, resolve absolute paths for command-line system calls.
Added CachedSimpleResource, a resource task that transparently uses the local filesystem to speed up access to remote URIs
[tmdb] Completed themoviedb.py scraper module

* Corrected MoviePredicateObject module to use owl.sameAs instead of dc.identifier
* Emit dc.date and dc.type (genre)
* Fix configuration api url
* Add Accept:application/json header to api calls
* Drop title derived from filename
* Fixed poster being used as fanart instead of backdrop
* Cosmetic: use of both "http://themoviedb.org" and tmdb_base variable has been made consistent (only url now)
* Use CachedSimpleResource for configuration api call