A paver (Python build and configuration utility) plugin

This add a plugin for Paver: http://paver.github.io/paver/ it has been tested on OSX, but not on Linux (however it should work also smoothly there).
I think you got this backwards. You need to generate the target list if you update pavement.py, so the condition should be [ pavement.py -nt .paver_targets ]. You probably took this from the gradle plugin, have a look at https://github.com/robbyrussell/oh-my-zsh/pull/2167/files