Merge pull request #63 from kpartlow/master

changed default assertion to 'output.return'
- Made many n-cube classes available to executing GroovyExpression
- Made all of Cedar Software's java-util code available to executing GroovyExpression
- Added getCube(), getAxis(), getColumn() APIs to NCubeGroovyExpression
- Made findColumn() on Axis public
- CdnClassLoader now allows dynamic loading of .class files
- Updated Javadoc
- updated readme
[maven-release-plugin] prepare release 2.9.15.201410071109
[maven-release-plugin] prepare for next development iteration
- Further refined CdnClassLoader
- Updated to newer version of Groovy 2.3.7 from 2.3.4
- Removed accessors getInput(), getOutput(), and getNCube() from GroovyExpression