Update 'connection_pool' dependency to ~> 1.0.0

This lets the newest 'sidekiq' gem (and others) work with this.

Change-Id: I55f202b2c31e69cea100db1139f0968e6643d160
Reviewed-on: http://review.couchbase.org/26638
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
In multi_json 1.7.5 they are removing VERSION constant

Change-Id: I1bb97d3f85fa3fe5fde4e206cc5cc1e7faee164e
Reviewed-on: http://review.couchbase.org/26667
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
RCBC-131 Couchbase::Cluster shouldn't require persistent connection

Change-Id: I12328da34d92239f9321acdd0d671bdff568f135
Reviewed-on: http://review.couchbase.org/26710
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Pass validations errors for HTTP requests

Change-Id: Ieb9372fb9b8acafe045431ccda9c6ee1ccb80f04
Reviewed-on: http://review.couchbase.org/26711
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Update dependency 'connection_pool' to '~> 1.0.0'

Change-Id: Ifaed7b28314dcaccd295dc5bd85a46113fe57af0
Reviewed-on: http://review.couchbase.org/26514
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>