Mark new mails with unread flag

[rm--]

... and remove flag if mail is selected

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• Bitbucket: https://bitbucket.org/transcode/correos/issue/1
• Originally reported by: Stephan Hoyer
• Originally created at: 2013-10-02T12:27:18.987

[keimlink]

Steps to implement this feature:

1. Add an is_read boolean field to the Email model which defaults to False.
2. Allow changing Email.is_read using the REST API, so that the front end can set it if an email has been read.
3. Change Email.is_read to True using the REST API if an email is selected in the front end.

If doing everything in a single pull request is too much, this can split into two pull requests. One implementing 1. and 2. and the second implementing 3.

[DebVortex]

The recently closed Pullrequest #13 solved the first 2 steps of the implementation.