MB-7359: Rename brewery property "geo.lng" to "geo.lon"

<mschoch> for breweries we encode the geo point as { lat: x, lng: y }
<mschoch> elasticsearch supports a variety of formats, but not that one
<mschoch> it requires "lon" not "lng"
<mschoch> if we switched to "lon" it would pretty much work out of the box

Reference: https://github.com/avsej/beer-sample/commit/5efe2032
Change-Id: I882959bea7991353b592724439be1005bb0ec13d
Reviewed-on: http://review.couchbase.org/22729
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Bin Cui <bin.cui@gmail.com>