Fixed Clover configuration

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481333 13f79535-47bb-0310-9956-ffa450edef68
Updated project building instructions

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481334 13f79535-47bb-0310-9956-ffa450edef68
Fixed typo

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1481343 13f79535-47bb-0310-9956-ffa450edef68