Release vesion 0.2.1

There are at least four issues (#42, #65, #68, #87) relating to problems with versions being out of sync (GitHub vs Node vs version number in the source). There also has not been a release since 2012, although several additions have come into play, which makes maintaining tests a hassle.

This pull request simply updates the version numbers and the History file of changes. 

Now all we need is for @LearnBoost (actually @rauchg) to update the NPM module :+1: