MergeViewRows() helper function.

Merges view rows coming in on sorted channels, needed for future
commits on view memoization and _all_docs processing.
Start of couchDbAllDocs().
Views only iterator through NumPartitions.
Implemented _all_docs, capitalizing VBucket.

As part of implementing _all_docs, needed to graduate vbucket to
the capitalized VBucket so the main package can get at it.
Web UI BucketDDocsCtrl().
Moved cbgb web/UI to port 8091 and stop serving NS web U/I.

Now there are 2 ports...

- 8091 - NS REST api (/pools) and cbgb's REST api (/_api)
  and cbgb's web UI (/_static).

- 8092 - Couch/CAPI REST api (/{db})

I'll remove the NS web U/I static assets in a later commit.
Remove NS static web UI assets (static-ns directory).