Fixes page titles for Login and Register
Idea to reduce width requirement, diverts from wireframes more
Updated CSS to make use of reduced width requirement
Adds proper links for web header and "post a snippet"
Removes unnecessary header text
Update URLs now I see URLconf supports "/"
Add line numbers to editor

@cmcl @MichaelDyson91  what do you think?
Change submit button text to be more intuitive