Otto's built-in .Export() does what OttoToGo was documented to do

(but OttoToGo didn't)

cbugg: closes bug-445
Turns out sum wasn't implemented in otto.  Implemented it.
HTML fixes for renamed params.
Don't silently fail, jsonEncode
Don't sum NaNs and Infs

cbugg: close bug-449
Native reducers + a useful test suite.

cbugg: close bug-451
initial support for bucket uuid
couchbase uuid is actually 32 chars with lowercase hex
rest_ns now supports bucket uuids

uuid is part of bucket details
bucket_uuid parameter is part of bucket URLs
if bucket_uuid parameter is present, it is validated

cbugg: close bug-442
initial support for get/head database in rest_couch

does not yet understand vbucket ids or bucket_uuids
cbugg: bug-446