added vtag to robject setContent.
changed Search method signature to return score and count.

changed Search method to return byte slices without string conversion.
Merge branch 'master' of https://github.com/natural/goriakpbc

Conflicts:
	robject.go
Make sure test passes on Riak 1.4

Riak 2.x (pre-release now) returns "No index ... found", 1.4 does not return an error