HttpCore Tutoral update

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1633147 13f79535-47bb-0310-9956-ffa450edef68
Simplifed SSLContext initialization code in examples

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1633170 13f79535-47bb-0310-9956-ffa450edef68
Removed duplicate section

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1633171 13f79535-47bb-0310-9956-ffa450edef68
Added tutorial sections on embedded servers and pipelined request exection

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1633330 13f79535-47bb-0310-9956-ffa450edef68