Update for compatibility with Underscore.js 1.5.0

The signature of `bindAll()` [has changed][changeset], and now requires
a specific list of method names for binding.

[changeset]:
https://github.com/jashkenas/underscore/commit/bf657be243a075b5e72acc8a8
3e6f12a564d8f55
Merge pull request #15 from there4/master

Update for compatibility with Underscore.js 1.5.0