Add SDWebImage and CachedImage class
Add speaker placeholder and convert speaker VC to use cached image from github.
Move speaker images directory.
Convert speaker small images in the talks cells to use web images.
Fix speaker image frame.
Move sponsor images to the root level
specify .png in the sponsor plist file for images.
Make sponsor images load form the server
Add sponsor title message and accessory view to table cells.
Merge branch 'refs/heads/master' into speaker-image-caching

* refs/heads/master:
  Could be useful in the future.
  Make sure the "Break" text is centered inside the label.
  Better map generation code when opening in Apple maps app.
  Remove pin title
  Use data from plist files instead of hardcoded values for location and party.
  Show the map under the title bar.
  Make sure talks, sponsors and speakers are all using the cached data and only fall back to local data when necessary
  cache location and party plists form teh network every app opening.
  add party and location plists.
Merge pull request #35 from MohawkApps/speaker-image-caching

Speaker & Sponsor image caching from server