Fix changelog entries

Change-Id: Idea9a4ff19c497e7317b12521a52a779c1b0f59f
Add pybuild stuff to gitignore

Change-Id: Ie2dce2b852dae134f4bbe6b90aef7d9adf257f7f
Make coverage module optional during test run

Change-Id: I79f767a90a84c7b482e0cc9acd311619611802e9
Refactor out df path to a constant

Change-Id: I23bfaaa70aa7f0d285d9f6867000acfd18df4d73
Switch to pybuild system

Change-Id: I6e84b9a90a145b46f3427ad77a777ad16041a6ff