fix #50: browserify -s
Transitions for path enter and exit
Simplify main createEdgePaths function
Remove safari karma launcher

Occasionally, with the Safari launcher, Safari gets stuck in a state
where it cannot be stopped, doesn't appear as a process, etc. but is
still hanging around in the OSX app switcher. In this state it is
impossible to launch a new instance of Safari. For now I'm pulling
Safari launcher until this gets resolved.
Initial transition work for clusters
Remove phantomjs
Tweak width on etl-status demo
Update CHANGELOG
Merge branch 'browserify-umd' of git://github.com/bollwyvl/dagre-d3 into bollwyvl-browserify-umd
Remove unused browser.js