0.0.1-alpha.6: Minor UX improvements

This pre-release has a couple of improvements:

• Using util.inspect instead of JSON.stringify to show values of large circular values in the browser.
• Fixed sidebar in the realm browser #96
• Making the "Download ROS" link more visually distinct and opening in the external browser #92 and #86
• Using defaults when connecting to ROS: Improving (but not fixing) #87