SAMP Support

[maray]

Using http://astrojs.github.io/sampjs/ we should be able to send NDData and Astropy tables from local apps or from a server (e.g. JupyterHub) to the SAMP Hub.

[cvalenzu]

Some progress with SAMP, we save the container to tmp/<timestamp>.fits and send via sampjs, but we need to get it working on Jovial before integrating the code.