This involves various template changes to adapt to new bootstrap.

Also:

* New responsive sheets and added responive classes into templates
* Add navigation to accounts section
* Simplify product listing templates
* Product lists enlarged images
* Single promo in the side bar
* Add btn-full for button full width responsive
* Checkout nav slightly adjusted
* Add responsive nav into the accounts
* Correct CSS class-name typo
* Make empty basket message a bit more sensible
* Remove in-page link to product description
* Widen price columns on basket/checkout as some currency symbols start
  wrapping
* Add whitespace to detail page availability messages
* Remove snowcone from project

Issues:
Fixes #351
Fixes #349
Fixes #345