Adding search to the blog

search layout;
search page;
search css and images;
search javascripts.
search box and refactoring of search code

- added a search box in base and search templates;
- moved search related code in an include file.
removed jquery

- jquery is included by CoveoSearch, removing it from the include
script.
Adding Coveo Search Analytics
removing duplicate html element

body and div had the same id and class, removed the useless div
fixed analytics tag

- removed data-send-to-cloud, it's true by default;
- fixed the token.
Merge pull request #20 from carlbolduc/master

adding Coveo Search to the blog