Device list should allow user to perform actions on many device

[qgeissmann]

From @qgeissmann on April 14, 2015 9:41

Multiple selection should allow us to start/stop a list of devices at the same time.

Copied from original issue: gilestrolab/pySolo-Video#93

[qgeissmann]

In order to make that work, we could:

1. get selection
2. check all devices are in the same status ("running" vs "stopped"). if not, send error message
3. check all devices share the same software version (and branch). if not, send error message
4. if user want to run several devices, use data from one device to build form, then send same form to all devices
5. if user stops devices, show modal confirmation window. Then send "stop" to all devices.
6. open a new tab for each altered device?