Bump version to 0.8.0.

Update version to 0.7.0.

Update version to 0.6.3.

Bump CMake version to 0.6.2.

It was incorrectly left at 0.6.0 when 0.6.1 was released, so this needs to be done to make it consistent between the tagged version and the CMake version.

Fix paths in pkg-config file (#556)

pkg-config should be giving absolute paths rather than relative paths.

Bump version to 0.6.0.

Bump version to 0.5.3.

Bump version to 0.5.3.

Bump version to 0.5.2

Bumped version to 0.5.1