Internalize ProductHeaderValue

What Haacked, PaulBetts, and Shiftkey suggested
Removed new line, doh.
More newlines

And usings :thumbsup:
Third Time's a charm
Merge remote-tracking branch 'origin/master' into internalise-ProductHeaderValue
Merge pull request #406 from trsneed/internalise-ProductHeaderValue

Internalize ProductHeaderValue