Added ability to set a default indexer for trakt notifier used for adding shows from watch list so that SickRage knows what indexer to set the show as.

Indexer mapping now uses indexer api calls to gather its information and then stores it to a new table called indexer_mapping for instant lookups later on.

Fixed trakt related issues for adding new shows and syncing.

Centered items at bottom of pages to just look a little nicer and fit properly.
Merge remote-tracking branch 'upstream/nightly' into nightly

Conflicts:
	sickbeard/__init__.py
	sickbeard/databases/mainDB.py
	sickbeard/helpers.py
	sickbeard/postProcessor.py
	sickbeard/traktChecker.py
pep8 code style changes post merge

post nightly merge, down to 14 pep code style errors from 658