igrigorik/decisiontree — pull request #2 by louismullie (2012-07-25 22:09:29+00:00)
Title: Graphr as gem

The [Ruby classes](http://rockit.sourceforge.net/subprojects/graphr/) used by decision tree to interface with the GraphViz graph generator have been released as a gem under the name [graphr](https://github.com/louismullie/graphr). These commits add `graphr` as a runtime dependency in the `gemspec` file, and require the gem at runtime instead of checking for availability of manually installed classes.