WordNode, WhiteSpaceNode, and PunctuationNode now accept children (fixes #6)
Appending or prepending a node into itself now throws (rather than looping till infinity)
Added a better internal hierarchy mechanism
Updated dependency versions of istanbul and jscs to 0.2.16 and 1.5.7 resp.
Update changelog for 0.1.0-rc.2
0.1.0-rc.2