Make tmpfs example compatible with both Python 2 and 3.
Make tmpfs example compatible with both Python 2 and 3.

Fixes issue 28.

Serebriakov/python-llfuse,darkfeline/python-llfuse,Serebriakov/python-llfuse,darkfeline/python-llfuse,darkfeline/python-llfuse,Serebriakov/python-llfuse