New enhancement: Utilize source maps to get fileName, lineNumber, columnNumber from minified source

[eriwen]

In support of stacktracejs/stacktrace.js#44

Useful: https://github.com/novocaine/sourcemapped-stacktrace/blob/master/sourcemapped-stacktrace.js

[niemyjski]

I'll be soooo happy when this is completed

[eriwen]

This is ready for a first pass. I have created #6 for multi-level source maps, but I'm hoping others will use this and provide feedback for other enhancements.