IEX API

[isomorphisms]

There is a new, excellent, free API provided by IEX. Who knows for how long, but quantmod might as well use it while it lasts.

I am willing to write the code for this.

[isomorphisms]

@joshuaulrich and I discussed by IRC that websockets (IEX DEEP) are probably not a good fit for quantmod right now. (might be a fit for https://github.com/phil8192/ob-analytics)

However github.com/jeroen/jsonlite already handles streaming, so if quantmod decided to use the epolling the only issue would be opening a websocket (currently on github.com/rstudio/httpuv and maybe other places --- Rook probably can do it if you add a function to the base app for handling the ws://).