Update deps, fix Gruntfile for browserify
Add caps to demo
Add support for XEP-0221 Data Forms Media Element
Add support for XEP-0152 Reachability Addresses
Don't require supplying an object for IQ replies
Call callbacks for invisible commands
Add support for XEP-0191 Blocking Command
Add support for XEP-0310 Presence State Annotations
4.1.0