node_server branch user testing

Have done a bit of interacting with the live system and finding a couple of things:

In app install, am getting a not found dialog (also at burritomap vhost)

From paste json: the uploading documents gif spinner is not closing on upload complete.

Test dataset is a 650k set of 177 world countries, with their ISO-type codes and stuff and simplified geographies, json array available here: http://h.sfgeo.org/a300mphach/jsonpnaturalearth/countries.json

In general getting some slow, hangy interactions with urls like:

http://datacouch.com/socket.io/1/jsonp-polling/1-numbesnumbers-5440?t=13-numbers-861&i=0

and same as above .../xhr-polling/...

(I am probably doing all this while you are pushing changes ;)

We can maybe break the pieces of this into separate issues and close as they are addressed, am not sure which of several possible interactions are triggering unexpected behavior

Start by reproducing the app-install not-found dialog, the paste-JSON upload spinner, and the slow or hanging socket.io polling URLs using the linked 650k-country dataset. The issue names no files or tests, so first locate the node_server entry points and the upload and polling handlers. Done means the reported interactions complete without the dialog, stuck spinner, or unexplained hangs.