model#geoNear fulfills promise when results empty

fixes #1658
updated benchmarks to output appropriately for pull requests
Merge pull request #1620 from 10gen-interns/gh-1412

fixed #1412; Subdocuments use their own transform
Added support for GeoJSON on Query#near

Had to upgrade to mquery 0.2.7 to do that. Also added tests for this.
fixes #1482