Update to new build process and turn on lint.

This introduces a minor change to the constructor API because the kwargs now must be keywords and not positional.

I haven't tested these changes on device yet. Please only merge you test it or I follow up later to say its tested.

For adafruit/circuitpython#475

Author: tannewt

.gitignore

@@ -1,2 +1,5 @@
 _build
 __pycache__
+.env
+build*
+bundles