Some README updates for local component dev.
Missing a bracket
Merge pull request #1086 from mozilla-appmaker/component-docs

Some README updates for local component dev.
Channel Updates
+ Added new channels, you can now choose 3 numbered channels (1,2,3) per color.
+ Added some labels to the broadcast / listener menu
+ Made it so that when you're choosing a channel color, the other listeners/broadcasters are hidden until you finish
Merge branch 'develop' of github.com:mozilla-appmaker/appmaker into develop