Rework html to use bootstrap

The templates now use bootstrap to
 * be responsive to different screenresolutions
 * make forms more pretty

Also the "login" and "register" link are only shown when not logged in
respectivly the "logout" link is only shown when logged in.
Moves the container to the general layout.html

The container and coloumns were only on send.html, but
they are a general design that should apply to all pages.
Add header to aboutus page
Merge pull request #14 from syntonym/master

Use bootstrap