[doclint] Move doclint under utils/

This patch:
- moves doclint under utils/ folder
- adds tests to verify doclint basic functionality

This patch also drops the jasmine as a spec runner for the doclint
checks. It turned out it's hard to customize jasmine's behavior,
so instead this patch implements a dummy spec runner.

The dummy spec runner allows us:
- to format messages however we want (the custom jasmine reporter would
  also allow us to do this)
- to avoid `beforeAll` functions which pollute global to pass
  initialized variables over to specs

References #14

.eslintignore

@@ -1,2 +1,3 @@
 third_party/*
 examples/*
+utils/doclint/test/