My first guess is that there are some errors in your file that disable animation.
I have opened your model.dae file with blender andI have noticed at least 2 errors OMHO.
They are in the following video : http://youtu.be/BGnVVpMNY4E .
You therefore might work a bit more on your model and if you need a step by step tutorial to animate your collada model into a THREE.JS based webgl viewport, then you can check this tutorial : http://jiteshmulchandani.com/?p=122
As mentioned on this page:
Get the latest plugin from http://opencollada.org/ and export the model using the following options checked :
Normals
Triangulate
Enable export
Sample animation
Note : When exported using the Autodesk Collada format, it doesn’t play skeletal animations.
The corresponding demo is right here : http://jiteshmulchandani.com/zombie-outbreak/ColladaModelTest.html (to control the model, use ASDW keys)
Hope this helps