Removed references to deprecated JUnit classes

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602394 13f79535-47bb-0310-9956-ffa450edef68
Removed obsolete test case

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602396 13f79535-47bb-0310-9956-ffa450edef68
HTTPCLIENT-1394: minor improvements in CurrentWindowsCredentials

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602397 13f79535-47bb-0310-9956-ffa450edef68
 HTTPCLIENT-1394: made WindowsCredentialsProvider a decorator for an arbitrary CredentialsProvider

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602398 13f79535-47bb-0310-9956-ffa450edef68
 HTTPCLIENT-1394: added factory methods for HttpClient instances configured to use integrated Windows authentication by default

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602401 13f79535-47bb-0310-9956-ffa450edef68
Added Win auth example

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602402 13f79535-47bb-0310-9956-ffa450edef68
Upgraded JNA to version 4.1.0

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1602403 13f79535-47bb-0310-9956-ffa450edef68
Upgraded HttpCore to version 4.4-alpha1