Added a listings index which displays every listing in the db; removed old static listings page and routing of it. Added ListingsHelper which users ActionView::Helpers::NumberHelper to delimit prices in pages; updated pages to use number_with_delimiter to display prices.
Changed index to wrap to a second row in a better fashion when listings>4.
Merge pull request #35 from sourlows/dlc_18

Dlc 18
Merge branch 'master' into dlc_19