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Merge remote-tracking branch 'origin/python3' into python3

Conflicts:
	pytmx/pytmx.py
handles floats and rotated objects
readme
issues 33, 34, 35 fixes.
new tests (issues 33, 34)
Update readme.md
Update readme.md
Update readme.md
Update readme.md
new test
Merge remote-tracking branch 'origin/python3' into python3
fixed math issue between 2.x and 3.x
version bump
update to show map data in tests
Update readme.md
make pygame optional