[fix] fix language support in photon engine

Add 500px and Searchcode engines

Allow to search for images on 500px. It doesn't use the official API, but the page result. Less stable, but less API key to possess...

Two engines were necessary for Searchcode because there are to search mode : search for documentation or search for code example. Both use open APIs.

[fix][enh] Multiple JS changes in Oscar

[enh] add photon engine, and fix pep8 errors

[fix] fix kickass engine

thanks @Cqoicebordel in #144:
https://github.com/asciimoo/searx/pull/144#issuecomment-67036903

[enh][oscar_template] replace kickass icon

Kickass torrent search engine

Add kickass in engine list
Add content for the result from kickass

Html+Bugs in templates

Add the alt in favicon

Alt on favicon
No <p> in <p>
Correct alt and title on img

Put the result URL at the top, like in other results template
Put the magnet link on the same line as the stats (peer/seed).

Alt on favicon
Width of image should be 400 and not 400px
Correct alt+title on image
No <p> contains <p>