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)
Make our logging capture python warnings
Stop suppressing deprecation warnings
Make unit tests fail due to deprecation warnings
Fix a few instances of deprecated get_plugins functions
Fix some deprecated usage of Exception.message
Rename deluge `user` and `pass` options to `username` and `password`
Deprecate old options
Don't break python 2.6 compatibility
Fix some references to import_series
Test for series configure loading alternate name
Ability to import single alternate name
Configure_series with alternate_name

Series output by configure_series will now have alternate_name set to
the contents of entry['alternate_name'].
This commit merges tests used in development into test_series.
Prefix field name with plugin

Series alternate names are now loaded from
entry['configure_series_alternate_name']
Make manager events a bit more consistent
Change config loading to not call sys.exit()
Moved config pre-check code to the check plugin.
Add a 'daemon reload' command to reload the daemon config from disk
Bump ipc version
Fix client daemon ipc version negotiation
Make a manager.initialize event
Left wrong rottentomatoes key in
Fix a tvdb test
Fix some issues with trakt plugin
fixing test_trakt