Presentation improvements and .LESS-support

- New styles
- now using .LESS for styling
- Fixed product presentation with units for cl volume and alcohol %

Unfinished work:
- databound dropdown for 'orderby' filter (not yet actiated)
Restyling and new filter UI features

- upgraded bootstrap to 3.1
- restyling of favourite-products-view, header and search-bar
- added filter functionality

Unfinished work:
- "Clear filters" not working 100%