Add support matrix

[dblock]

Is your feature request related to a problem? Please describe.

Users don't have a place to find what's supported with what. For example, a user asks what the minimum JVM runtime environment is.

Describe the solution you'd like

Publish a set of support matrices in the product documentation, showing OS, JVM, browser configurations we've tested with, and inter-compatibilities between product versions.

via @julesg, Probably should cover "validated" or "tested" configurations rather than "supported" ones... since the project itself doesn't offer 'support' in the same way a commercial service might.

[aetter]

#62