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* Introduced ability to run steps within a transaction (thanks to Ryan Williams
for suggesting this functionality along with assorted bug fixes.)
* "post-apply" migrations can be run after every successful upward migration
* Other minor bugfixes and improvements
* Switched to <major>.<minor> version numbering convention
Version 4
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* Fixed problem installing due to missing manifest entry
Version 3
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* Use the console_scripts entry_point in preference to scripts=[] in
setup.py, this provides better interoperability with buildout
Version 2
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* Fixed error when reading dburi from config file
Version 1
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* Initial release