Merge pull request #16 from travisbrown/master

Added example.
Added faux kind polymorphism example.
Merge branch 'topic/kind-poly'
Bumped version to 1.2.3 and cross build against 2.10.0-RC3.
Added release notes for 1.2.3.
Added .worksheet.
Bumped version to 1.2.4-SNAPSHOT.
Added 2.10.1-SNAPSHOT to the cross build.
Bumped release version in documentation.
Build for 2.10.0-RC5.