feature request: streaming data

[jeremymanning]

support streaming data-- @KirstensGitHub had found a package for this (maybe it's already integrated). i think we want to specify:

• [x] a data file to get data from
• [x] an initialization interval to compute PCA transform from
• [ ] an update interval; new data since last read should be read in, transformed using the PCA transformation, and added to the plot

we may also want to allow the user to specify a camera rotation speed (e.g. have the camera orbit the plot, facing in, where we specify the number of revolutions per minute)

[jeremymanning]

note: let's not implement this prior to our release.

[andrewheusser]

closing...added to v2 features project