Make seriesToPoints_ and stackPoints_ private. They are being rendered as part of JSDoc, which is wrong, but also, seriesToPoints_ has the closure substring "<?", which jsdoc likes to think is PHP.
lightweight dead code elimination
Merge branch 'master' of github.com:danvk/dygraphs
Merge branch 'official-master' into sauter-custom-datahandler

Conflicts:
	dygraph.js