Avoid regex in the common case
Avoid regex in the common case

Escaped characters in field names are highly unusual. We can quickly
test for their presence and if none are found do the path splitting
using the more efficient binary module instead of regular expressions. A
microbenchmark shows this approach to be a little more than twice as
fast as the original.

kxepal/couchdb-mango,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,apache/couchdb-mango,fkaempfer/couchdb,fkaempfer/couchdb,cloudant/mango,fkaempfer/couchdb,cloudant/couchdb-mango