Fix tests

* Fixes #52
* vows version bump
* Implement better streaming command runner in `Cakefile`
* Syntax fixes and minor enhancements for test suites
* Precompile test suites and run them in JS (see flatiron/vows/#296)
* Cakefile enhancements
  * New command runner (ensures proper sequencing, streaming output,
output color support)
  * `cleanup` task and helper