Created backup branch with modified readme.md

This branch is for backup only, not general use.
Changed download mechanism to use a Blob

Previous mechanism was ignoring filename, returning 'download' with no
.csv extension (though data was OK). I changed the structure to use a
blob instead and link to that blob.
Merge remote-tracking branch 'origin/backup'

Conflicts:
	GA_overview.js
	readme.md