New approach: Mocha reporter that detects usages of "supertest"

- no need to learn new syntax
- can use normal Mocha before() for mocking
- just seems like the role of a reporter

Doesn't mean we should generate docs from any bunch of supertests.
Ideally you isolate a subset of tests to make representative samples of the API.
Merge pull request #3 from rprieto/reporter

New approach: Mocha reporter that detects usages of "supertest"