Fixed npm install error
Fixed npm install error

The current version on npm does not install correctly. It fails on the
browserify command:

browserify -d -o node-xmpp-browser.js lib/node-xmpp-browserify.js

The error browserify gives is:

Error: Cannot find module: "JID" from directory

This is caused by an incorrect require in lib/node-xmpp-browserify.js
which I fixed in this commit.

node-xmpp/node-xmpp,xmppjs/xmpp.js,node-xmpp/node-xmpp,WeBest/node-xmpp,qbit/node-xmpp,agebrock/node-xmpp,ggozad/node-xmpp,tempbottle/node-xmpp,ggozad/node-xmpp,agebrock/node-xmpp,qbit/node-xmpp,stliu/node-xmpp,xmppjs/xmpp.js,eelcocramer/node-xmpp