[MJAVADOC-363] [Patch] Port maven-javadoc-plugin from httpclient 3 to httpclient 4
Submitted by Mat Booth.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1463966 13f79535-47bb-0310-9956-ffa450edef68
add contributor

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1463967 13f79535-47bb-0310-9956-ffa450edef68
use last httpclient version 4.2.3

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1463968 13f79535-47bb-0310-9956-ffa450edef68