RFC - Integration tests

Add baseline integration tests to the project :bowtie:

The runner ``cujs-compiler-integration-tests`` is a simple program and it's easy to to add tests:
- Create a file for closely related functionality
- Specify expected output between <expect> </expect> tags
- Add a concise program to exercise feature

Known issues:
Tests that are currently red: loop, conditional, and object literal
Automate building and deploying compiler for tests isn't done
Adding test other dependencies such as, c++, objective-c, or libraries will require more work