Fix to cookie parsing algorithm in RequestHeaders
Adjust cookie parse fix to make it more tolerant.

- Made the algorithm more tolerant of malformed cookies
- Added a test to cover the fix (which currently does pass).
Merge branch 'CookieParsingBugFix' of https://github.com/erdomke/Nancy into erdomke-CookieParsingBugFix

# By Eric Domke
# Via Eric Domke
* 'CookieParsingBugFix' of https://github.com/erdomke/Nancy:
  Adjust cookie parse fix to make it more tolerant.
  Fix to cookie parsing algorithm in RequestHeaders
Styling fixups