remove browserbuild dependency
update to debug 0.7.0

debug 0.7.0 has a browserify field
update ws to 0.4.25

ws 0.4.25 contains a browser field for bundling
remove require coverage from index

this breaks bundling
require emitter-component

It is confusing to have competing package managers within the same
require system. No.
use bundleable version of xmlhttprequest
use bundleable version of ws