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)
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
Try to make download plugin failure reasons more descriptive.
Pythonic
Merge pull request #206 from tubedogg/aria_bugfix_1-2-81

aria2 Plugin - Better sample config; bug fixes
s/aria/aria2/
Update plugin_transmission.py

Verified the access to the id with the return from the new add_torrent() function.

Valid
Add description to default make_rss template
Update plugin_transmission.py

corrected ommission, thanks Chase
Merge pull request #210 from DColl/patch-1

Update plugin_transmission.py (base64encode & cli.add_torrent & cli.change_torrent) fix #2415
Tweak imdb joinedload query a bit.
Removed joinedload from imdb, improves performance. Refs #2364.
Merge remote-tracking branch 'upstream/develop' into develop
Bug fixes

Set default for aria_config/dir so we don’t have to check it’s
existence repeatedly
Set correct parent_folders when multiple directories exist in the
torrent structure
Get movie_year and year to be set correctly when parsing movie names
Fix unicode bug when rendering fields before passing to aria2
imdb_lookup no longer tries to capitalize non-string errors. fix #2450
Make task abort properties public, for plugins to view.
Make sure email plugin does not email on silent aborts.
Fix a unit test.