Removing empty xml tags should make the agent more resistent.
Add user option to use rounded rating values.

This will round to the next half int, which will prevent
plex from showing the full floating point precision.
Scan for episode thumbs of multi episode nfos.

This will recognize locally saved thumb images for
multi episode nfos, if they are named

Series Name.S0XE0Y.Episode Name-thumb.jpg or
Series Name.S0XE0Y-thumb.jpg
S0XE0Y-thumb.jpg
S0XE0Y.jpg
Fix artwork recognition for TVShows without series folder.
Merge pull request #38 from SlrG/master

Various fixes and enhancements.