Additions

This is the crude code a colleague has produced to suit our needs for a image repository and proxy as an alternate to one we already had based on picasa web albums, whichs api fails more and more everyday.

Changes are mainly in:
- able to create any size based on params w,h not just fixed sizes
- changes to pagination so we can see a complete XML files of the available images
- added a "count" option to controller so we can determine total amount of images on search
- added a feature to return the position "x" of a search instead of only by id
- watermark for images on creation
- changes to importer to add/update images
- additional cache for queries
- hash for user to use on non-logged URL queries