Changed the TaskRunner to start and run update tasks.
Also changed the way the different updates are defined as to comments received on r2ddd386d1d.
Coverage: code coverage testing for Python
Coverage.py is a Python module that measures code coverage during test execution.
It uses the code analysis tools and tracing hooks provided in the Python standard
library to determine which lines are executable, and which have been executed.
For more information, see http://nedbatchelder.com/code/modules/coverage.html