A bug fix release for cljs.spec and a REPL regression.

As always feedback welcome!

Fixes

• CLJS-1759: Errors writing transit analysis cache if parallel build
• CLJS-1760: Self-host: test-cljs-1757 failing in test-self-parity
• CLJS-1751: port fix lost type hints in map destructuring
• CLJS-1756: Add test.check JAR to the bootstrap script
• CLJS-1757: cljs.spec/exercise-fn doesn't work when passed a quoted symbol
• CLJS-1754: Add boolean? generator
• fix REPL regression which removed warnings
• CLJS-1763: Defining a var that clashes cljs.core throws a compiler error instead of warning
• CLJS-1772: Dependency index can incorrectly overwrite .cljs files with .cljc files if both are present