Added gui for IMDB watchlists in Config General.
Used regex checks with javascript popup, for checking if valid imdb csv watchlist.
Added test/test_tvdb_api.py for testing the tvdb api for retrieving shows by IMDB id.

TODO: Help for assisting users in getting the correct IMDB url.
maybe, make interval configurable

First changes for imdb watchlist checker

Thrown the couch code overboard and created my own version of an imdb watchlist scraper

Added IMDB thread and test values with an IMDB csv url. These values should be replaced by front end UI settings.

- Removed some tracelogs when unable to download watchlist
- Added settings for enabling and setting of the watchlist csv url
TODO:
- create UI for setting from frontend
- Implement frontend and backend checks for validating the csv url

Default interval is 1 hour.
Merge pull request #833 from KontiSR/dev_imdb_checker

First changes for imdb watchlist checker