Added API documentation.

Removed unused example framework.
Added template files for the pages.
Updated endpoint documentation
Major refactory

This is basically a complete rewrite.

Moves the code to use the new json format from subsurface.

It also moves the code to use webapp2 from google, and templates.

It is not complete yet. Photo upload and dive deletion is still
missing.
Add again support to upload pictures

Now it uses the blobstore. It has an awkward API but
it should be better to avoid hitting quotas.

In any case, we move the photos to imgur.