Metadata change

The code for the new version of the metadata. Can be used to generate the XMBC in both the new and old format.

Only the changes in the following files are needed:
sickbeard/__init__.py
sickbeard/tv.py
sickbeard/webserve.py
sickbeard/image_cache.py
sickbeard/metadata/__init__.py
sickbeard/metadata/generic.py
sickbeard/metadata/mediabrowser.py
sickbeard/metadata/ps3.py
sickbeard/metadata/synology.py
sickbeard/metadata/tivo.py
sickbeard/metadata/wdtv.py
sickbeard/metadata/xbmc.py
sickbeard/metadata/xbmcorig.py
data/interfaces/default/config_postProcessing.tmpl
data/js/configPostProcessing.js

tvdb_api & checkVersion (have changes in them that are nothing to do with this change - don't know how to exclude them) or squash commits sorry

Have tested the generation of metadata providers. config.ini is updating correctly.
The PostProcessing screen is showing the new options.

The code for Season Fanart isn't working and is skipped in all Metadata providers