some eap changes

- added an overview diagram - this way, people find the model diagams a bit easier
- added a script to export all eap images. Since this documentation will be build by travis, it makes no sense to  add it to the build, but I thought it still makes sense to have this scipt for an easy export.
- In order to match the exported images to the already existing image names, I changed the naming of the diagrams in the model