Add lots of stuff to gemfile

Among others:
* Devise and Cancan
* Heroku stuff
* GFM
* Bootstrap, Bourbon, Font awesome, autoprefixer
Add devise model `admin`

Run `rails g devise admin` and add confirmable module.
Setup mailing host

Also adding letter_opener for dev env
Add name and position to admins

Position could be something like "Webbansvarig", "Projektledare", etc.
Add devise views

Run `rails g devise:views`
Disable reconfirmable for now
Minor route tweaks
Add ability model, role structure

Inspired by Tony Amoyal's approach, two tables are used to manage
different admin roles. One for the actual different roles, and one
to link the roles to the admins.
Add common locale file, structure
Improve static_pages structure

This affects both routes and the static pages controller. Some
routes are translated.
Improve stylesheet structure
Improve layout structure
Make application.js to coffee
Responsive and layout fixes all over! :v:

In short:
* Add scroll effect on header
* Improve header content
* Improve beamer on static pages
Add responsive menu and change font

Not exactly the most DRY solution out there, but the result
is good. Now you'll have to create two sepparate menus. One
for desktop, and one for mobile. This makes sense, since
different screens probably leads to different needs.
Move js to head, add GA tracking when in prod
Add About-content, basic look structure
Make redirect mtd tld requests to 2014 page

Add custom routing constraint and send all requests to
*medieteknikdagarna.se to 2014.medieteknikdagarna.se.
Add Procfile
Add unicorn config