Share embedded dashboards which do not require login

[codingchili]

Allows dashboards to be shared and accessible without logging in. Killer feature.

[codingchili]

in the current state of kibana this is nearly impossible to achieve. Any client loading a shared dashboard is also responsible from loading the data to populate the dashboard. Allowing the clients to fetch the data to populate the dashboards is not secure. There needs to be a server-side function to compile the dashboard.

[codingchili]

Make an attempt using phantomjs/node-webshot module. The plugin will sign its own token to use for the request, if the url is a "dashboard url". The snapshot taken is streamed back to the requestor, client size needs to be taken into account.