added rebar executable and added ibrowse dep
cleaned up .app.src
improved start procedure to use app.src instead of hardcoded
added notify call that receives proplist
added types
improved types
added CHANGES
now uses ibrowse v4.0.1
Merge branch 'master' of https://github.com/ypaq/erlbrake into HEAD

Conflicts:
	rebar
	rebar.config
	src/airbrake.erl