initial commit of the new template 'oscar'

* base.html mostly implemented
* stats.html implemented
* about.html implemented
* most of preferences.html implemented
* using bootstrap.js
little enhancement of oscar template

* improve site-titles
* add message which tell you if no data is availabe yet
remove text from alert-info in /stats
add more tooltips to preferences
oscar template: improve style for check and uncheck of engines
oscar template: using tab to seperate engines in preferences
oscar template: make the categories clickable
oscar template: add directory in which are messages stored
oscar template: implement search input, index page,...
oscar template: update messages
oscar template: implement first version of results page

* implement results page
* improve search form template
* implement all result_templates
* fix youtube engine
oscar template: improve image results
oscar template: improve result page

* add paging support
* add suggestion panel
* add links panel
oscar template: add forgoten github icon
oscar template: little style improvements
oscar template: remove unused css file
oscar template: implement autocompleter
oscar template: generate bootstrap.min.css from source
oscar template: using less to generate oscar.min.css
oscar template: include typeahead.css into bootstrap.min.css