Update plugin_transmission.py

As of transmissionrpc-0.11-py2.7.egg/client.py
add() & add_uri() are deprecated.

Althought, I was getting transmissionError (Query failed with result:...) when trying to launch a new torrent. So I went in the rpc/client code and used the same syntax they use to base64 the data and everything'sback to normal working order ^^

Althought I suspect that line 339 (for id in r.keys(): ) won't work with the return from cli.add_torrent(), I'm not equipped to deal with that (don't know when it occurs)
Remove broken imdb_rated plugin
Fix a bug in subtitles plugin
Make sure imdb_id field is being used over imdb_url
Cleanups
Find plugin handles filesystem encoding better.
refs #2295, #2065, #989, #1347
Make path encoding/decoding helpers a bit closer to python 3 ones
Fix --explain-sql
Add back --profile
Silence an ImportWarning from deluge plugin
Work around encoding bug in tmdb3. refs #2392
Make sure find plugin doesn't crash with invalid timestamps. fix #2434
New trakt.tv acquire/remove plugins

Movies, series and episodes are automatically recognized and
added/removed to/from the trakt watchlists, collections, seen and custom
lists.
Small fixes
Merge pull request #203 from tarzasai/trakt_submit

New trakt.tv add/remove plugins
Add no_entries_ok plugin to silence nuisance warning messages
Make pylint be quiet
Better sample config; bug fixes

Provide better sample configuration for cli
Catch additional render errors
Bug fix - use correct method of allowing aria2 to set gid
Change API URL
Merge pull request #207 from tubedogg/prowl_bug_1-2-81

prowl Plugin - Change API URL