Catch loading errors in specs, including syntax errors, and report them as failures during test execution

[alanmyrvold]

Currently errors when loading specs, including javascript syntax errors, result in passing tests in the test runner, which isn't ideal.

There is a try/catch in lib/index.js, so assuming you want other specs to run when some specs have errors in loading?

In this change I create a new describe/it to represent the failure when loading the spec.

An alternative change would be to remove the try/catch or re-throw the exception.

[juliemr]

Thanks for the fix! I merged the two commits together and submitted as 40de2849a6601ee387096b5d0667da3790d04911