workflows: fix imports in tests
installation: egg info adddition for dependency links
installation: version parsing from dependency links
travis: initial configuration
config: adds demosite specifc configuration

* Adds module with demosite specific configuration.

* Adds config module in entry point, allowing it to be loaded
  automatically by Invenio.
Merge pull request #6 from lnielsen-cern/pu-site-config

config: adds demosite specifc configuration
Merge pull request #4 from jirikuncar/pu-travis

Travis integration and installation fixes