Note skin, plumber build, source refactor, fixes

[jamespamplin]

• Notes toggle using scribe commands
• New commands to collapse a single note and collapse all notes
• Separation of code into multiple sources
• Various fixes
• Implemented new styles for notes as a "skin" (src/skin/gu-noting.less):

[robinedman]

We still seem to be inlining lodash?

[rrees]

I may have missed this but can you make sure the README is accurate regarding the final process for build and test?

[robinedman]

I can do some work on the README.

[jamespamplin]

@robinedman Removed lodash from build. Much smaller now :)