Rename 'docPointerUp' to 'pointerUp'
Add pointerMove to debug object
Fix dx/dy of start events so that they are 0
Add mocha and chai devDependencies for testing
Rename package to "interact"; tidy package files

I chose "interactjs" originally because "interact" was taken on npm.
However, I don't think this has much use being published on npm so the
name clash is not a problem.
Replace Qunit tests with mocha and chai
Make tests easier and fix issues reported by tests
Bump version to 1.0.6