Find ways to optimize sending GeoJSON data between client/server

[aashish24]

Ref: https://github.com/mapbox/geobuf

[aashish24]

Ref: #269

[brianhelba]

Ping @manthey . This is relevant to the work he's doing with the HTTP API for vector annotations (which is a cousin dialect of GeoJSON). Also, those annotations will be rendered with GeoJS.

[jbeezley]

Also, tippecanoe for tiling geojson datasets.

[matthewma7]

Based on latest development and discussion, sending large geojson is ok, but visualizing large geojson is the issue. The current industrial trend is vector tile. Closing this.