Add dependency: Phalanges 0.1.2
Use Phalanges to handle key events. Fixes #11.
Bump dependency versions

* Phalanges 0.1.2 => 0.1.3-SNAPSHOT (patched)

Note that we're currently using a patched version of Phalanges to work
around a typo that prevents version 0.1.2 from finding the goog.events
namespace at runtime. Once the typo is fixed upstream, we can rely on the
official stable version again.