I suggest looking at what the standard approach for this in the Python world. In particular, what tools such as the Python Package Index recommend. Basically the Python equivalent of http://getcomposer.org/doc/02-libraries.md#specifying-the-version

Cheers

--
Jeroen De Dauw
http://www.bn2vs.com
Don't panic. Don't be evil. ~=[,,_,,]:3
--