Minify globals prior to transpiling

This fixes #65 by performing minification on globals prior to
transpiling.
Test dev code removal for System.defines

This tests System.defines that are minified to be sure that the
steal-remove-start/stop code is also removed.
Remove development code in the multi-build

This adds the ability to remove development code from the multi-build
using the same configuration option provided by pluginify. Fixes #67
Merge pull request #66 from matthewp/global-minify

Minify globals prior to transpiling
Merge pull request #68 from matthewp/multibuild-clean

Remove development code in the multi-build