Update to new build process and turn on lint.

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

@@ -87,3 +87,7 @@ ENV/
 
 # Rope project settings
 .ropeproject
+
+.env
+build*
+bundles