Replace python-config with pkg-config.

Also check if we have python2 and bail if we find python3
manager: Add a missing expand property
manager: Add padding preventing resize grip overlap
sendto: Fix autoconf option, closes #59
Add pygobject to dependancy list
Do not unload pulseaudio module bluetooth-discover
Merge branch 'deb'

Conflicts:
	blueman/plugins/applet/PulseAudio.py
Update CHANGELOG.md