no longer supporting node 0.6

Is no longer supported by the Node.js project itself.
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
fixed #1376; subdocuments now use own toJSON opts

subdocuments and populated paths were using the parent's toJSON options
instead of their own. This fixes that.
ocd