simple reimplementation of the form data parser including _charset_ field support

git-svn-id: https://svn.apache.org/repos/asf/chemistry/opencmis/trunk@1628709 13f79535-47bb-0310-9956-ffa450edef68
added unit test for form data parser

git-svn-id: https://svn.apache.org/repos/asf/chemistry/opencmis/trunk@1628711 13f79535-47bb-0310-9956-ffa450edef68