CharArrayBuffer to implement CharSequence

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1599241 13f79535-47bb-0310-9956-ffa450edef68
HTTPCORE-365: added method to create HttpHost instances from String

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1599242 13f79535-47bb-0310-9956-ffa450edef68