Create Validator class

This class refactors some of the validation semantics (and places the
constants as class identifiers). It also adds support for depth-based
limiting (something

Create Validator class

This class refactors some of the validation semantics (and places the
constants as class identifiers). It also adds support for depth-based
limiting (something which may be useful later on).

Change-Id: Iff2d9ca8007d86c7e13e913a21ca26f5b2a858b4
Reviewed-on: http://review.couchbase.org/50800
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Dave Rigby <daver@couchbase.com>

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