Release 2.0.0-beta4

Continueing to have issues with npm.  This should
be the final fix.  This beta represents the version
directly following our initial beta.

Change-Id: I32e750e9232a4863421cfcd0ba17e0cd8cb8678b
Reviewed-on: http://review.couchbase.org/41448
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Brett Lawson <brett19@gmail.com>