Show pending listings with a yellow background

Adding status method delegations to Listing.
Fix email display for wanted ads
New fangled hashes instead of ol' timey ones
Adding "Retired" Ad Status
Add listing icon (for wanted or for rent)
Add blank option for gender dropdown on "wanted" ad
Fix "Rooms" section for "For Rent" listings
Order listings by available_on on the index page
Scope "for-rent" and "wanted" CSS
Widen for_rent_or_wanted div by a bit