unload_ext behaves correctly
unload_ext behaves correctly

Set _loaded to False on unload so the module can be reloaded later.

jjangsangy/python-matlab-bridge,jjangsangy/python-matlab-bridge,arokem/python-matlab-bridge,blink1073/python-matlab-bridge,jjangsangy/python-matlab-bridge,blink1073/python-matlab-bridge,arokem/python-matlab-bridge,blink1073/python-matlab-bridge,arokem/python-matlab-bridge