[MERGE] Fix ability to use IIS as an HTTP server by unquoting the boundary (fixes #247585)

[Vincent Ladeuil]

Vincent Ladeuil has voted approve.
Status is now: Semi-approved
Comment:
This is the right version (several submissions were sent for this fix 
from several emails), I'll reject the others.

lifeless already approved the tweaks that led to this version, so I'll 
merge it

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C487C917F.4080504%40gmail.com%3E