Update download file names

Remove date/time stamp; change ordering of fields.
Update cache
Update site list content

Include metadata; include Unknown when needed.
set cors request headers
Minor text change.
initial graph data support
fixing units for derived values models
Merge branch 'initial-graph-support' of https://github.com/gina-alaska/imiq-api into initial-graph-support

Conflicts:
	app/controllers/derived_values_controller.rb