plex_tools.alt_id_lookup crashes from malformed URL

[Metalor696]

When building the request to call Plex, the line req = Request('{}{}'.format(plex.url, movie.key)) isn't stripping the leading backslash from the movie.key params so we end up with something like 'http://192.168.1.100:32400//library/metadata/730' when it should look like 'http://192.168.1.100:32400/library/metadata/730'.

This causes Plex to return a 404 and the script to exit.

[meisnate12]

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