include umd distrbution for use in browser

[elmerbulthuis]

[moll]

Hey! Thanks for helping out! I'm not sure this is something I'd like to have in the master project as I don't see much of a future in non-concatenated JavaScript and keeping build artifacts in source control leads to some other issues.

I can however see the use of the occasional pre-browserified code, which probably was why you made this change. :-) What do you think about releasing this change in a different package and track this one? Perhaps with a "-dist" suffix (standard-http-error-dist)? Is pre-browserified code you need often?

Thanks again!