Update docs with targeted development version

[ehkropf]

Put in the docs mention of the targeted development version (2014b).

Original question: "Should we pick a minimum version of matlab to design toward?"

[tobydriscoll]

This is tough. We're not using features introduced in recent versions of matlab, and I'm not aware of any we will need to. You never want to leave behind users who can't afford the latest and greatest.

OTOH it's never easy to determine whether some recent arrival has been slipped in unless you develop and test in multiple versions, which is beyond the scope of a small project. Mathworks is not helpful in showing when changes were introduced.

I propose that we develop for 2014b, which was one of the larger changes and which has the latest graphics system, so that we will see what other people will see going forward. We keep releases/docs updated with "tested in Matlab version xxx" where xxx changes over time. And if compatibility issues arise, they can be addressed by the community; they are usually not hard to work around.

[ehkropf]

Agreed. I should add this to the documentation.

I will likely be a provider for some compatibility updates (n.b., I've got access to many older versions for testing -- thanks current employer!) since I have a colleague who needs to use this but can't be bothered to update his machine.