CSS tweaks for vertically-centered text on toolbar buttons
More extra bottom padding for main container
This submission contains the following changes:
 - Add a new FlickrPhotoCache class that serves as the backing store for both the photo sidebar view and the flickr photo vector layer. The existing protocol that's connected to the vector layer has been removed. This gives us more fine-grained control over how flickr photo markers are populated and updated
 - Add a new photo sidebar view that shows a paginated view of the WKT Flickr photostream. Each "page" updates the flickr photo vector layer in turn.
 - Add a new link to the new photo sidebar in the home sidebar, navbar and the floating map toolbar