Add comments to some classes in Helios-Browser
Merge pull request #513 from johnnyt/helios-browser-comments

Add comments to some classes in Helios-Browser
Make server URL clickable in iTerm

iTerm doesn't recognize URLs unless they start with an explicit http://
I did some drive-by recategorization in Repl class, too.
Merge pull request #514 from cdlm/say-http

Make server URL clickable in iTerm