Bookie add by email tool

A quick first version of an add by email tool for https://bookie.io.

I have implemented a first version with Playframework on google app engine, this works entirely by email, registering accounts can be done by sending a mail to [email protected] with the api key in the subject. This will check the api key and generate a user-specific key for the email upload of the form username.base32, which then can be used with the emailaddress [email protected] to create bookmarks with the url in the subject.

The whole thing is missing a few things like tags, depending on how this pans out, this may get added later.