Refs #369: apply camel case selectors in all public pages

The following types of selectors were NOT changed to camel case style:
- selectors that appear in big JS or PHP functions;
- selectors that come from plugins (jQuery, select2, etc);
- selector ".mw-headline" from Preferințe page (I couldn't find it with grep);
- selectors that appear in the database (like checkbox ids from Preferințe page);
- ids for licences types;
- selectors from admin folder.

Also, I've removed the HTML element name from selectors ("div.resultBar" became ".resultBar", for example), because the old method affects performance, see http://google-styleguide.googlecode.com/svn/trunk/htmlcssguide.xml#Type_Selectors.