Release 2.0.0-beta3

Whilst named beta3, this is in fact beta2 however
the beta2 name was used to fix an npm bug on beta.

Change-Id: Ifa1ab586f5d2a2c9ddc6422f92da8a59b8936cdd
Reviewed-on: http://review.couchbase.org/41432
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Brett Lawson <brett19@gmail.com>