Removed custom #hashCode and #equals methods that do not correctly reflect object identity

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1637960 13f79535-47bb-0310-9956-ffa450edef68
Use CharSequence instead of CharArrayBuffer for header element parsing

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk@1637961 13f79535-47bb-0310-9956-ffa450edef68