plex plugin additions

new option for non-latin letters in title
new generalized option for stripping all parens
Update plex.py
Update plex.py
Update plex.py

can be like this, but python regex smart enough to divide range '-' char from literal '-' without escape.
Revert da1156e..54d4e5b

This rolls back to commit da1156e4ce52b6047915a24a5743cbcc6d44d54c.
Update plex.py

change 'strip_non_alpha' option to except apostrophes (')
Merge pull request #288 from exscriber/develop

plex plugin additions