Update tests to split out Analytics.js and GA.js
Return null when scripts will not render anything
Move display feature test logic to script class

Since these features are now split out in the different helpers,
test the Gajs code in the gajs helper class and add tests for the
universal testing.
Fix ga.js test for loading from Google as subdomains are removed
Update universal code with ecommerce tests
Repair code mock for view helper tests
Use phpunit from composer.json to test
Use php codesniffer to validate coding standards
Fix CS with newlines at EOF
Merge pull request #31 from juriansluiman/feature/unit-tests

Unit tests for ga.js and analytics.js