Adds a Panoramio class

Easy querying to get panoramio images for a given bounds. Returns
attributes suitable for an Image model.
Removes unnecessary logging from Panoramio
Adds an Image model for handling PA Images relations

Currently uses Panoramio to retrieve image URLs and store them
Creates has_many relation for Images on PA
Merge branch 'pa-images' into add-wikipedia-article

* pa-images:
  Creates has_many relation for Images on PA
  Adds an Image model for handling PA Images relations
  Removes unnecessary logging from Panoramio
  Adds a Panoramio class

Conflicts:
	db/structure.sql
Refactors WikipediaSummary as WikipediaArticle

Better representation of the domain -- model represents article rather
than attribute
Removes unnecessary variable assignment in tests
Adds search to WikipediaArticle to find by article title
Introduces a Wikipedia Summary class for fetching article summaries
Adds a wikipedia summary worker to fetch summaries for PAs