Allow limiting maximum document body size
Allow limiting maximum document body size

This is a companion commit to this one:

https://github.com/apache/couchdb-couch/pull/235

COUCHDB-2992

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb