Updated documentation to include features and characteristics
v2 changes

v2 changes
Update since we moved
Published gh-pages to GitHub pages.
Merge branch 'gh-pages' of github.com:datasetio/atlas-schema into gh-pages

Conflicts:
	README.html
	characteristics.html
	features.html
	index.html
	nodes.html
	relationships.html
	sections.html
Published gh-pages to GitHub pages.