Improve docs for running in dev with signonotron2
Add basic user session
Add list of data sets to index page

- This uses an editable pip target for performanceplatform-client, this
  needs to be changed when the AdminAPI is released.
Set the testing flag in tests

This propagates errors, makes debugging tests easier.
Use version 0.0.6 of performanceplatform-client
Do not sign the user in if they are not allowed

If the user does not have the signin perm then they do not have access
to the application.
Merge pull request #10 from alphagov/list-my-datasets

List my datasets