The XMI export of the repository has 50 MBs. It has several drawbacks:
- it took 30+ minutes to export (to xmi v2.1, v1.1 was significantly faster and "native" version even faster (and smaller by 20 %)
- large files are not allowed on github see: http://git.io/iEPt8g

solution
- Git Large File Storage - https://git-lfs.github.com might be used
- native export version (neaten) can be used
- repository an be broken down to smaller pieces (i.e. User Needs, Func. Areas, etc.
The XMI export of the repository has 50 MBs. It has several drawbacks:
solution