parse can parse operation query field

@imlucas 

parse can parse the query field of an operation e.g.

2014-05-31T14:20:56.002-0400 [conn16] query test.coll query: { query: { foo:
"value", bar: "another value" }, orderby: { number: -1.0 } } planSummary: EOF
ntoreturn:0 ntoskip:0 keyUpdates:0 numYields:0 locks(micros) r:106 nreturned:0
reslen:20 12ms

query: `{ foo: 1, bar: 1}`. 
moved parsing of operation stat fields into its own function