Added HTTP_Negotiate scheme and helper to support Negotiate Authorization. The fall back case handled to submit a form in case authorization is not perfomed through SPNEGO
Corrected comment
Changing the constructors for service class
Merge pull request #20 from anilallewar/2.1

Fixed technical limitation around reading chunked protocol buffer stream
Updated method comments
added one more constructor to service class with functionhandler and challange scheme.
Merge pull request #19 from shantanud/2.1

Changing the constructors for service class to add username and password
Merge remote-tracking branch 'upstream/2.1' into 2.1
Merge pull request #18 from onkar-dhuri/2.1

Added HTTP_Negotiate scheme and helper to support Negotiate Authorization. The fall back case handled to submit a form in case authorization is not perfomed through SPNEGO