Bootswatch Theme API Support

[versx]

TODO:

• Save themes locally?

[TurtIeSocks]

Is the resizing of the header an anticipated result?

Everything seems to work though, I think putting it somewhere in 'Settings' would be better. Or at the very least to the left of the Clear Cache button. It seems out of place currently.

[Mygod]

In some themes:

• Top right banner buttons are not vertically centered.
• The top bar also covers the map controls.
• Pokemon/Pokestop title uses the alternative text style but not Gym title. Also all other text still uses the old style (including font).
• Font used in filter menu is also inconsistent.
  
• Some theme does not differ red buttons and default buttons, e.g. Journal.
  
• Dropdown menu has incorrect text color sometimes.
  

Overall comment: I guess it is cool? Although I think the theme switch should be for server admin only. I do not think adding this feature is worth the maintenance efforts. (just look at number of bugs I found from my light testing)

[clburlison]

No strong opinions either way... It works. Shetchy is a strong contender for best theme. I do think I'd rather this get hidden under the user settings.

[versx]

Closing in favor of #224