Spelling correction in xapian bridge

Xapian bridge now performs spelling correction
on a users query and returns the correctedQuery
(which could be an empty string) as part of the
JSON response to client.

[endlessm/eos-sdk#1982]
Yea, but you have to call `iter.next()` to get the first element as well, so the initialization part of the for loop would be awkward (would be two statements)