adds listing seeds to the in mem database
Merge pull request #78 from felguerez/db_seeds

Db seeds
Navigation styling. Moved header into partial view.
Merge branch 'development' of github.com:felguerez/top-secret-final-project into development
>> Adds column category to listings table, and fixes tests to account for listing category.
Styling 'all listings' page. Two-column, with map!
>> Applys a specific category class to each listing div in the listing index view
Merge pull request #79 from felguerez/layout_listing_styling

Layout listing styling
Merge branch 'development' of https://github.com/felguerez/aircycle into all_listings
Updates listings index view
>> Adds isotope to the listings view
Merge pull request #80 from felguerez/all_listings

All listings
adds isotope.js
Merge pull request #81 from felguerez/all_listings

All listings
Merge branch 'development' of https://github.com/felguerez/aircycle into create_listing_form

Conflicts:
	lib/air_cycle/entities/listing.rb
	spec/db/shared_spec.rb
	web/app/controllers/listings_controller.rb
	web/app/views/listings/index.html.erb
	web/app/views/listings/new.html.erb