Enhanced testing support for the translator

[brynrhodes]

Develop a new mode for the CQL-to-ELM translator that can translate the tests into valid ELM files so they can be more easily integrated into engines. I did something kind of like this for the cql-execution project and it's been really helpful. See: https://github.com/cqframework/cql-execution/blob/master/test/generator/src/main/java/CoffeeScriptTestDataGenerator.java