Issue with installing versions > 0.7.0

[r1chardj0n3s]

All versions after 0.7.0 have a problem in installation - the punq tests folder is installed into site-packages (alongside the punq folder).

This causes all manner of weird issues since that tests folder is discovered in preference to a local project tests folder by some tooling.

I would recommend that either the tests folder be excluded from packaging, or that it be moved into the punq folder.

[avin-kavish]

All versions above 0.7.0 are versioned as dev releases, this is the latest 0.8.0.dev1