version 0.5.2 final (17-March-2015):
	* Expose the spy when using spy_on as a context manager.

	  Patch by Todd Wolfson.


version 0.5.1 final (2-June-2014):
	* Added support for spying on unbound member functions on classes.


version 0.5.0 final (23-May-2013):
	* First public release.
