Improve Plugin UI

I've made a number of display related changes...

- add thumbs for TV Shows and Episodes
- add support for Seasons
- add correct summary for Episodes
- use Episode titles where available
- display correct Season/Episode info
- display a correctly sized episode thumb

![screenshot_27_01_2014_12_24_pm](https://f.cloud.github.com/assets/680871/2005617/e54f417c-86f1-11e3-88b4-7572ea5d7d33.jpg)
![screenshot_27_01_2014_12_25_pm](https://f.cloud.github.com/assets/680871/2005620/fd54d4b2-86f1-11e3-991d-5e35b1b19b1c.jpg)
![screenshot_27_01_2014_12_26_pm](https://f.cloud.github.com/assets/680871/2005621/2220f582-86f2-11e3-98ee-57faf9d2b04a.jpg)
![screenshot_27_01_2014_12_27_pm-2](https://f.cloud.github.com/assets/680871/2005622/4798547c-86f2-11e3-91f7-644ba9920b1b.jpg)