Log Message:
Update ruby-mocha to 0.14.0.

## 0.14.0

* Official support for MiniTest v5. All tests now pass on the continuous
  integration build.

## 0.14.0.alpha

* Add speculative support for Minitest v5. Due to incompatibilities it has not
  yet been possible to run the Mocha test suite against Minitest v5. However,
  @zenspider (author of Minitest) provided the patch and he has tested it
  against Rails v4. Fixes #156. Thanks to @zenspider.
* Documentation updates.