Added an extra 'dev' backend, useful when testing the application during development.
A dev-proxy script also helps in working separately on frontend and backend code.
Changes that check for a weird condition that was causing cards to get corrupted.
A similar change has been applied also to /gamma (in a different commit, though)
The new application layout (single backend with multiple versions of frontend application) handle 'dump' requests (aka 'offline copy') from a different url