[#17] Add css, jQuery, enhanced functionality

* CSS temporarily complete, now using Ubuntu font
* jQuery added for links
* Other subject added for contact form
* Validation added for contact form
Merge branch 'task-17-enhance_layout_and_design' into develop
[#20] Fix link header css and dump assetic
Merge branch 'task-20-fix_link_header_css' into develop
Merge branch 'develop'