Remove support for multiple eventTypes in a single #on or #off.
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Merge pull request #13 from matthew-andrews/single-event-type

Remove support for multiple eventTypes in a single #on or #off.
Fix for #root not being chainable
Update jsdoc for #root
Fixes to the jsdoc
Bump to v0.2.1
Small improvement to the unset test - calling root() on a delegate that has no root doesn't make so much sense... test was not realistic.
Merge pull request #14 from matthew-andrews/chainable

Make #root chainable, corrections to incorrect jsDoc & more
Bump to v0.2.1
Add a slightly more realistic example #15