First pass at Kickass Engine

Parse and return results correctly. Pages numbers taken care of.

Not done, and maybe to do :
- 'content' : I don't know what it could be. Maybe votes ?
- 'categories' : the results are not filtered by categories, because I don't see how to do it properly : there are too much categories on Kickass. Is 'video' only movies, or also tv show or porn ? So for now, the category is 'all'.
- Favicon/icon : may be a good idea.
Add KickAss engine
Add icons and badge for the themes
Add kickass in engine list
Add content for the result from kickass
Merge pull request #144 from Cqoicebordel/KickassTorrent-Search-Engine

Kickass torrent search engine
Rework Flickr Engine
Everything was redone to use the API. It needs an API key, but it's worth it.
Everything works. Title, Image, Content, URL
The API allow lots of things. Thumbnails and date will be easy to add when it will be implemented in Searx.

Fix asciimoo/searx#126
Add an No Api Flickr Engine
It uses the webpage json infos to build the results
Let the user choose the engine in setting.yml. Noapi active by default
+ little corrections on Flickr engine
Merge remote-tracking branch 'origin/Flickr-engine' into Flickr-engine

Conflicts:
	searx/engines/flickr.py
	searx/settings.yml