Some Code improvments

Just fixed a Bug NFO couldn't be found at search.
Some Code redesign.
Merge branch 'master' of https://github.com/gboudreau/XBMC-Movies-Metadata-Agent-for-Plex
Revert "Get clean MPAA rating in case the <mpaa> value is a sentence (e.g. 'Rated PG-13 for continuous crude and sexual humor, including language')."

This reverts commit b244d4c73a86d00bf316adf5e8725ee8f2698205.