Draft JEP on pattern matching

[Brian Goetz]

I've published a draft JEP on the first phase of Pattern Matching here:

     https://bugs.openjdk.java.net/browse/JDK-8181287

Additional notes on our explorations can be found at:

     http://cr.openjdk.java.net/~briangoetz/amber/pattern-match.html
     http://cr.openjdk.java.net/~briangoetz/amber/switch-rehab.html

After there's been a chance for public comment, I'll be aiming to submit 
this JEP next week.