Make an official (numbered) release version of the code published with our paper, then begin following version numbering conventions

[davidlmobley]

See http://semver.org/ for info on version numbering conventions.

We should make an official (numbered) release version corresponding to the code published with our paper, and clearly indicate in the version description what this is. We then ought to begin tracking "official" versions so these can be specified by people writing papers using this code. Issues can then be tied to specific versions for their resolution.

[ppxasjsm]

An easy way of versioning is using this versioneer tool:
https://github.com/warner/python-versioneer
It is easy to set up and allows automated versioning.