Move current work into 'ttw' folder

ttw stands for 'the tiny world' and is a first crack at automating a small
virtual environment. It includes some tests however I don't know how much of it
is currently working since I haven't played with it for a while. Just doing som organizing for now.

renamed:    Environments.py -> ttw/Environments.py
renamed:    Interfaces.py -> ttw/Interfaces.py
renamed:    Modifiers.py -> ttw/Modifiers.py
renamed:    Monitors.py -> ttw/Monitors.py
renamed:    Tests.py -> ttw/Tests.py
renamed:    TestsRun.py -> ttw/TestsRun.py
renamed:    env.py -> ttw/env.py
renamed:    run_ttw.py -> ttw/run_ttw.py
renamed:    tests/run-tests.sh -> ttw/tests/run-tests.sh