Version bump and changelog entry for 0.13

Version bump and changelog entry for 0.12

Version bump and changelog entry for 0.11

Merge pull request #121 from mfrodl/0.10

Version bump and changelog entry for 0.10

Version bump and changelog entry for 0.9

Version bump and changelog entry for 0.8

Version bump and changelog entry for 0.7

Version bump and changelog entry for 0.6

Version bump and changelog entry for 0.5

Version bump and changelog entry for 0.4