Don't strip output of pandoc

For markups like Markdon, spaces in output can potentially be significant (e.g. code). Therefore, they should not be stripped.
Specifying mocha version.

This version of mocha avoids the following error:

    No Mocha monkey-patch for MiniTest version
Merge remote-tracking branch 'origin/pr/5'

* origin/pr/5:
  Don't strip output of pandoc
Updating tests for gh-5

See commits:

* 2f1f34099
* 01faf2e1b
Version bump to 0.6.1
Regenerate gemspec for version 0.6.1