Added tests subdir
Added loop test.
Working on tests
Working on levelling
Minor tweaks
Merge branch 'feature/UnitTests' of https://github.com/greenenergy/tasktoy into feature/UnitTests
Initial levelling working. Now need to take prereqs into account
Working on prereqs
Merge branch 'feature/UnitTests' of https://github.com/greenenergy/tasktoy into feature/UnitTests

Conflicts:
	tests/test_tasks.py
Merge branch 'feature/UnitTests' into develop
Checkpoint work on levelling