Merge pull request #650 from ltratt/grmtools_0_15_0

Prepare a 0.15.0 release.

Merge pull request #632 from ltratt/grmtools_0_14_2

Prepare a 0.14.2 release.

Merge pull request #622 from ltratt/grmtools_0_14_1

Prepare a 0.14.1 release.

Merge pull request #609 from ltratt/grmtools_0_14_0

Prepare a 0.14.0 release.

Merge pull request #493 from ltratt/grmtools_0_13_10

Prepare a 0.13.10 release.

Merge pull request #487 from ratmice/update_clippy

Update to latest clippy

Merge pull request #472 from ltratt/grmtools_0_13_8

Prepare a 0.13.8 release.

Merge pull request #462 from ltratt/grmtools_0_13_7

Prepare a 0.13.7 release.

Merge pull request #458 from ltratt/grmtools_0_13_6

Prepare a 0.13.6 release.

Merge pull request #447 from ltratt/grmtools_0_13_5

Prepare a 0.13.15 release.