Remove unused HTML elements
Add nav bar with links to root and settings
fixup! Render contract show view as a pdf
Add Settings model and show view
Adds #default to Settings, returns shared instance

* Returns Settings.first if it exists
* Creates new Setting if it doesn't exist with empty values
Adds edit view for Settings
Adds update to Settings
Moves navigation bar to application.html.haml
Adds company attributes to pdf rendering
Styles settings page