Fix wrong after-refactoring value
Add session 6. Not tested yet
Add sunspot example code
Fix bugs in python files when run
Fix dexy run
Minor fixes
Merge branch 'staging' of https://github.com/UCL/rsd-engineeringcourse into staging

* 'staging' of https://github.com/UCL/rsd-engineeringcourse:
  Minor fixes
  Fix dexy run
  Fix bugs in python files when run
  Add sunspot example code
  Add session 6. Not tested yet
  Fix wrong after-refactoring value