Extra Mains, Much better NPM and Global exports support, Smiley!

The new :extra-main-files option makes integrating things like tests
and devcards to your build super simple and CPU efficient
Learn more

There was a long standing bug with :global-exports support that I
was able to squash which in turn led to changes that make working with
npm modules much easier.

The new :npm option will help you make quick work of integrating
webpack bundled npm modules into your
build. Learn more

• added :pre-build-hooks and :post-build-hooks config options Learn more
• fixed the figwheel.main api in the CLJS repl so that it works
  properly under nREPL
• added the :build-inputs config option Learn More
• finally added the validation smiley \\(ツ)/, I pretty much had to after I saw this tweet