Nancy.Testing.Brower.HandleRequest shall be public

When Nancy.Testing.Brower.HandleRequest would be public, this would allow dynamic testcases based on path and http-method. A Nunit definition would then look like this:

    [TestCase("GET", "/users")] 
    [TestCase("POST", "/users")]
    [TestCase("DELETE", "/users/3")]
Merge pull request #1713 from yannisgu/openTesting

Nancy.Testing.Brower.HandleRequest shall be public
Update DefaultResponseNegotiator.cs

Added comment to prevent further pull-requests on changing this to a breaking behavior.
Overwrite Content-Type from headers
Use case-insensitive dict for Response headers
Merge pull request #1723 from curit/overwrite-content-type

Overwrite Content-Type from headers
Update Tokenizer.cs
Merge pull request #1725 from kthompson/patch-1

Update Tokenizer.cs
Fixed typo in HttpFile.cs
Merge pull request #1733 from 06b/xml-comment-patch

Fixed typo in HttpFile.cs
Pass NancyContext down to ValidationAdapters
Merge pull request #1739 from jayharris/validation-context

Pass NancyContext to DataAnnotationValidation Adapters