Fixes #110 - Prettify the setup wizard

Being the first point of contact for new users, the setup wizard needed
an overhaul to the UI. This adds a prettiness factor to the setup
wizard and hopefully gives a better overview of the settings and what
they do within the application.
Fixed drop down styling on setup step 3
Refined CSS flash message selector

After testing some basic functionality on the forums, there was a CSS
class that was overridding the framework defaults.
Removed CSS comments
Refined markup and CSS classes within the setup process

- Removed 'with the power of Ruby on Railsgit st' copy as it should already
  be obvious you are using Rails.
- Swapped out span's for p's for better CSS block support in the setup
  partial templates.
- Added spacing around textfields and tightened up the padding around
  the explanation text to better associate with the field.
- Refined CSS selectors to stop the clashing of the background colours
  and images.
Updated background colours and transparency
Merge pull request #112 from jacobbednarz/prettify-setup-wizard

Fixes #110 - Prettify the setup wizard