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
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
Fixed: Prevent submitting the form for each request.
Added comments and checked if we have JSESSIONID & JSESSIONIDSSO set in cookies.
Merge pull request #21 from onkar-dhuri/2.1

Fixed: Prevent submitting the form for each request.