Add teacher includes for use with Classnotes templatizing
Add Classnotes initial layout
Add sample of Classnotes layout content
Added generic resources, links to Classnotes layout
Separate resource content as includes to support topic-specific links/materials
Removed inlined content for course-specific links, added include

Layout now supports page.course variable for including class content
specific include for article/reference links
Add course frontmatter to sample classnote definition
Change classnote YAML field for teachers to plur to indicate array

Update the layout and classnote sample file to show use of array
for teachers' includes
teach.github.com -> training.github.com
teach.github.com -> training.github.com
Include MomentJS for long format date generation via YAML YYYY-MM-DD
Revert MomentJS integration.

Utilize Liquid function in favor of additional JS library
Use Liquid date for ISO-8601 date formatting output
Private class notes, testing template
reorder command line history and chat
Merge pull request #149 from github/classnote-template

Classnotes Templates for Easier Post-Event Material Generation