Basic viewer working.

Loads from GitHub repos and gists.
Much tweaking and adjusting.
Add GA code to viewer.
Tweaks to viewer wording. Update changelog.

And remove worksheets from core project.
Update to ignore worksheets.
Version bump for viewer deployment.
Uupdate changelog.
added instaparse
added a parser for a gorilla file
fixed the parser's output a bit more
added html generation to the parser itself
markdown component rendered
we finally emit a working html file
free segment rendered correctly
fixed margins and free-segment rendering
resulting markup fix, fixed console output formatting
added the right font
removed ugly magic css string
added calls to js rendered
added all other jslib items needed for rendering