unix needs some minor fixes

[Levitanus]

in __init__.py replace imports with local imports, still there is package named unix

if sys.platform.startswith('java'):
    from .java_ import PyMouse

elif sys.platform == 'darwin':
    from .mac import PyMouse, PyMouseEvent

elif sys.platform == 'win32':
    from .windows import PyMouse, PyMouseEvent

else:
    from .unix import PyMouse, PyMouseEvent

in unix.py some tabs appeared within spaces