Build tool changes for scala 2.11 support.

Support for 2.8+ is retained by switching to the scalac compiler
rather than using zinc. The gradle version is also bumped to 2.0
Remove usage of BeanProperty class.

This class changes packages from scala 2.9 to 2.11, which makes
it difficult to support a wide range of scala versions.

Instead, implement the java-style getter directly in two places.
Remove code-signing functionality.
Merge pull request #1 from ProjectFlorida/0.8.1.1-scala_211

0.8.1.1 scala 211