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
fix for Set >> #add:
Add a favicon

I took the image from amber-lang.net and removed the reflection; then I
used http://www.favicon.cc to generate the favicon.
Merge pull request #518 from kpullen/add-favicon

Add a favicon
Merge pull request #517 from mkroehnert/compiler

amberc: add help output for the '-D' flag
Fixes issue #519
Kernel: add Smalltalk>>#globalJsVariables
SemanticAnalyzer: use #globalJsVariabls in #errorUnknownVariable: method
Smalltalk: methods for adding/removing global JS variables
amberc.js: add js globals support
grunt-amberc.js: add support for JS globals
amberc: add support for JS globals
amber-cli: recompile