Put map to users

Add CSS to layout
Add location hash to dashboard
Add map to users show, users index, dashboard show 
Add accepts_nested_attributes_for user model
Add delegate city, state, latitude and longitude, to user model 
Add form.fields_for to user form partial
Clean up some code in the views, put some link tag to layout
Change hash name in location controller and user controller

The `users_path` helper does not require a collection of users to be defined.