Use a spec-compliant polyfill for bind
Use a spec-compliant polyfill for bind

Casper's prototype was not compliant (see n1k0/casperjs#631). While this is
fixed in Casper latest, it's an issue in older versions.

So, use mozilla's polyfill.

soney/SpookyJS,rotaryden/SpookyJS2,SpookyJS/SpookyJS