Forrest can turn on and off listeners. Next: same for trees
Issue #17 - Better way to store default options. Fn: deepExtend and buildOptions. Used on Forrest.
Tree can now turn on and off event listening
Fixing up bugs (misspelled method names, self and this)
Merge pull request #20 from cts/toggle-insertion-listening

1) Better option default helpers, 2) Toggle node insertion listening on and off.