feature: permissions

Closes #3 (closed)

@Marjolaine I've set up the test package here

Have a look at the files runner.py and tests_permissions.py, I left comments giving a tutorial on how django tests work :)

To run locally we need to point our local DjangoLDP server to our local djangoldp_energiepartagee by using symlinks. We also need to run the version of DjangoLDPv2.1 which is in https://git.startinblox.com/djangoldp-packages/djangoldp/tree/305-permissions-refactor. To do this we need to clone the branch locally and symlink to it in the local server as well

Next steps is to write the tests ! Good examples can be found in djangoldp_circle and in djangoldp.tests.tests_get