Mail service

The IntelliCloud mail service subscribes itself to the inbox of
intellicloudquestions@gmail.com. Once a new e-mail is received the
server pushes the message to the service where the message is being send
to the backend. Then a confirmation e-mail is send to the questioneer.
Mail service dlls
Updated app.conf in data layer.
Mail service update

- FIXED: Incoming mails are send to the webservice
- ADDED: A confirmation mail is send to the questioneer
- ADDED: Unit Tests
Added PostId and IsPrivate to CreateQuestion.
Added classes used for user authorization.
Sorted usings.
Added send answer plugin factory.
Added AuthorizationHandler, updated authorization classes.
Added required references for reading HTTP header fields.
Changed fields to properties; added AuthorizationHandler.
Added more useful summaries.
Fix name issue in SendAnswerFactory.
Merge remote-tracking branch 'upstream/master'
fixed include bug in question manager, added unit test for question manager
Merge pull request #35 from daanvc/master

Fixed bug in include in question manager and added a unit test for the question manager