Merge pull request #1214 from pysat/rc3_2_2

RC 3.2.2

Merge pull request #1204 from pysat/rc3_2_1

RC 3.2.1

Merge pull request #1162 from pysat/rc_3_2_0

Release Candidate 3.2.0

Merge pull request #1125 from pysat/jklenzing-patch-2

Update CHANGELOG.md

Merge pull request #1068 from pysat/v3-0-6rc

V3.0.6rc

Merge pull request #1046 from pysat/rc3-0-5

Rc3 0 5 release

Merge pull request #1040 from pysat/v3-0-4rc

V3 0 4rc

Merge pull request #1030 from pysat/version-patch

Update version.txt

Merge pull request #1014 from pysat/v3-0-2rc

V3.0.2rc

Merge pull request #821 from pysat/v3-0-1rc

V3 0 1rc