Added some comments to ScrollSpy.js
Removed unneccessary temporary variable

It's totally fine to use this.activeTarget. I think it's confusing to use activeTarget...
Added some minor formatting to ScrollSpy.js
Added new method inline docs
Added dependency on NodeList-dom

This dependency seems necessary since removeClass (used in activate)
depends on this file. See dojo docs

http://dojotoolkit.org/reference-guide/1.9/dojo/NodeList-dom.html#dojo-nodelist-dom
Merge pull request #83 from Shurakai/scroll-spy

Scroll spy