added images controller
configured routes for images.
created spec's for creating images, basic controller in place.
implemented fakeweb responses, stubbed out requests to flickr.
url maps to array of images at items/:id/image/new to be chosen from.
choosing an image redirects back to items list.
added prompts for choosing images from a url if present.
removed image link in items edit form, and added ability to change images of items.
links to items are live, will open in a new window.
will insert http:// on urls if not already present.
Merge branch 'master' into image_previews
removed prompt to choose an image, image field not available in edit.
cost field changes numbers to currency, truncated urls
added css around images for choosing images, buttons for new items/wish lists
changed titles on items and wish lists.