Feature/01 newdesign v2

Here the implementation of new design. Take a look at the mockups:

* open/join/create sections: http://invis.io/FWZGJWUS
* all other sections: http://invis.io/R2129K974

The index.html was split in many small files. This is the actual schema:

### unlogged

* Open -- done
* Create -- done
* Join -- done
* Import a backup -- done
* Settings -- done

### Logged

* Waiting for copayers -- done
* Addresses -- done
* Transactions proposals -- done
* Last transactions -- done
* Send form -- done
* Address books -- done
* Backup / Delete -- done

Full support for small (mobile) devices with an off-canvas menu.
Why are we returning index.html in any case? Failing while fetching an invalid URL it's critical, this setup can lead to unexpected behaviours and annoying bugs.