Adding test to prove issue with HTTP Header parsing in RestfulService

I have a header like:
X-BB-Auth: xxxx

and it is being given back to me as X-Bb-Auth - i want to prove the issue and the fix
FIX RestfulService header parsing now accepts non-title case headers
Merge pull request #2212 from dhensby/patch-3

Adding test to prove issue with HTTP Header parsing in RestfulService