Merge pull request #22 from kpartlow/master

Updated concurrency test to better test concurrency.  Tested on both binary content and string content as well as testing cached and noncached values.
 - Refactor CommandCell interface to have fewer APIs.
 - Bug fix: null check added for when 'Command Text' is empty and attempting search for referenced cube names within it.
[maven-release-plugin] prepare release 2.6.1.201406061120
[maven-release-plugin] prepare for next development iteration
-made GroovyShell static as it is advertised as re-entrant
-updated readme
[maven-release-plugin] prepare release 2.6.2.201406091128
[maven-release-plugin] prepare for next development iteration
Updated to support resources loaded from local path with res://