class AcceptBaseParser for parsing http accept* headers
added: acceptencodingparser.h
class AcceptEncodingParser for parsing HTTP_ACCEPT_ENCODING header
added: compresion only when HTTP_ACCEPT_ENCODING has 'deflate'
and the browser is not the Internet Explorer
git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@515 e52654a7-88a9-db11-a3e9-0013d4bc506e