Setting up for theme changing

sickbeard.THEME_NAME to be added to source inc_top & confing_general
broken until then.
Merge pull request #854 from Supremicus/switchable_themes

Setting up for theme changing
broke the arrows woops
Merge pull request #855 from Supremicus/switchable_themes

broke the arrows woops
Add theme_name to config and expose THEME_NAME global
Merge pull request #856 from adam111316/switchable_themes

Add theme_name to config and expose THEME_NAME global
styling fixes and clarify what to do after theme selection
Merge pull request #857 from Supremicus/switchable_themes

styling fixes and clarify what to do after theme selection
Merge pull request #858 from echel0n/switchable_themes

Switchable themes