Config - Auxiliary Comments for UMD Builds

[pksjce]

From @TheLarkInn on June 9, 2016 5:53

This is a reminder/placeholder to add documentation for webpack/webpack#2113

Can assign to me or PR's welcome.

• Add documentation on githubio page
• Add examples in examples page
• Add to wiki

Copied from original issue: webpack/webpack#2623

[skipjack]

See webpack/webpack#2113 where @TheLarkInn has already provided the details for the auxiliaryComment property with output configuration.