Version bumps to 0.7.

Update Changelog

Add Python 3 compatibility.

Version bumps to 0.5.1 for uploading to PyPI.

Version bumps to 0.5, see CHANGELOG.rst for details.

Remove a warning by replacing color_cycle with prop_cycle.

Fix a typo in README. Ready for next release.

Add rsc_decorator. Use Helvetica font for all plots.

Fix a serious error in README.

Ready for releasing v0.2.