This change provides:

• unminified, concatenated sources as stacktrace.concat.js
• unminified, concatenated sources with concatenated dependencies as stacktrace-with-promises-and-json-polyfills.js

This would be the first step to declaring stacktrace-with-promises-and-json-polyfills.js as the main file in bower.json. Using a minified version here complicates builds and development. Choosing the version that includes all dependencies is a safe default that will work without customization in most automated builds.