Test that ScriptExecutor is able to run a class with a main method.
Note that support for returning some useful binding is yet to be implemented, this test merely checks that nothing blows up.
Merge pull request #15 from rlovtangen/executeclasswithmain

Test that ScriptExecutor is able to run a class with a main method.
Moved gradle tests to subfolder structure
Added some doc
Added check for bad gradle build file
Added check for class file
Added multiproject build