Update documentation by nesting photos in report to ease report loading.
Remove pyramid_rest dependency in favor of traversal
Remove medium resource
Add photo resource
Dropped pyramid_rest in favor of traversal based royal: https://pypi.python.org/pypi/royal
Remove medium resource
Add resources:
- report
- photo: content is written in gridFS: It should be removed in favor of
  Amazon S3
- photo_content: To be removed in favor of amazon S3
Tests are not reliable enough

TO BE DONE:
- User resource: registration, authn and authz.
Fix unittest
Remove obsolete unittest
Merge pull request #1 from hadrien/master

Working on resources: report, photo and photo_file