GitLab

Setup versioning

See merge request !8

If you want to publish the package it makes sense to have a clean
versioning scheme. This is approached with git tags here. The tag should
be in the format defined by e.g. v1.0.1.

Tmp master

See merge request !7

in non interactive notebooks they are not needed

 - removed style_graph and style_label from RWTH Misc and 
mpl_decorations, added axis prop cycle instead
 - added explanation for cycler to RWTH Colors

- refactored ipynbs

  - feedback would be sent despite empty values
  - confirm button now sets its width automatically