Fixed a Bug with Newsletter Direct-login link

Signed-off-by: René Meye <rene@meye.md>
Prepare for being able to send to different receiver_groups

Signed-off-by: René Meye <rene@meye.md>
Implement Courses and Groups as Receiver Groups

Signed-off-by: René Meye <rene@meye.md>
Spec for Users_without_group

Signed-off-by: René Meye <rene@meye.md>
Select Users Without groups

Signed-off-by: René Meye <rene@meye.md>
Nicer view for Enrollments without group

Signed-off-by: René Meye <rene@meye.md>
Merge pull request #92 from frejbow/develop

removed unnecessary info from signature-pdf
Merge branch 'develop' of github.com:renemeye/finvorkurs into develop
Added Uploads by Tutor on Downloads Section

Signed-off-by: René Meye <rene@meye.md>
Up and Download of Files

Signed-off-by: René Meye <rene@meye.md>
Some enhancements on downloads

* Ignore Download Folder
* Nicer styling
* Added Date
* Reordered Last is on top

Signed-off-by: René Meye <rene@meye.md>
Security

* Upload only by Tutors/Admins
* Download only by users

Signed-off-by: René Meye <rene@meye.md>
Added Some Metadata to PDF Download

Signed-off-by: René Meye <rene@meye.md>
Removed Group Information from PDF

Signed-off-by: René Meye <rene@meye.md>
Added BMBF-Logo to Signature List

Signed-off-by: René Meye <rene@meye.md>
Added Room and Group to CSV

Signed-off-by: René Meye <rene@meye.md>
Much cooler Time view

Signed-off-by: René Meye <rene@meye.md>
Delete function

Signed-off-by: René Meye <rene@meye.md>
Root to rails root & storing under assets

Signed-off-by: René Meye <rene@meye.md>
Users shall not delete uploads

Signed-off-by: René Meye <rene@meye.md>