Disabling local Py3.3 testing

See https://bitbucket.org/hpk42/tox/issue/169/tox-fails-to-create-python-33-venv

This interpreter is still tested on Travis.
'sdist' target for local install added

Plus more verbose deps install
Starting dev on 0.2.6
Cursor hiding added for OSX/Linux

See #31. Note that this breaks ^Z interruptions (the cursor won't be
restored if you press ^Z).
tests: simpler stdout testing
using atexit to register the showCursor fun
cursor tests