fix startTracking so only runs when no clients are already connected
commented logging of full HTML body --> couldn't see any other messages
fix checkURL so that it only runs if trackedURLs[url] is defined --> will be undefined when no clients are connected
track connected clients, to avoid issues with multiple "connection" events for a single client
prepopulate client history with 0s, so the bars in the graph are not changing width
client: check for active socket before doing anything on #start click event, similar for #stop
Merge branch 'master' of https://github.com/divmain/f5yourself into local master

Conflicts:
	app.js
	templates/pageview.hbs