image loading in progress
basic image loading for manifestPanel working, with 'placeholder' elements and stages of loading represented. Interface rendering of newly added manifests, although there is a bug with it I don't quite understand at the moment. Fixes #33, fixes #37, #38. Some css improvements addressing #34, but nowhere near done yet.
Fixes #50. Finds the service even when there are multiple images per canvas.
Merge pull request #49 from IIIF/template-breakout

Template breakout
merge conflict