Merge pull request lindegroup#681 from lindegroup/1.6-dev

1.6 dev

Merge pull request lindegroup#669 from lindegroup/1.5.7-dev

1.5.7 dev

Merge pull request lindegroup#663 from lindegroup/1.5.6-dev

1.5.6 dev

Merge pull request lindegroup#655 from lindegroup/1.5.5-dev

1.5.5 dev

Merge pull request lindegroup#649 from lindegroup/1.5.4-dev

1.5.4 dev

Merge pull request lindegroup#644 from lindegroup/1.5.3-dev

1.5.3 Merge to master

Merge pull request lindegroup#638 from lindegroup/1.5.2-dev

1.5.2 Merge to master

Merge pull request lindegroup#627 from lindegroup/1.5.1-dev

1.5.1 Merge to master

Merge pull request lindegroup#620 from lindegroup/1.5

1.5 Commit

Updated change log and versions.