Import MarkupLexer from thewritingpot. We also need the unit tests associated with it.
Import MarkupLexer from thewritingpot. We also need the unit tests associated with it.

git-svn-id: 07e90cf55c51d05f6e47e58d22f17c514a1aa358@18 48356398-32a2-884e-a903-53898d9a118a

r-kovalenko/htmlpurifier,bartbutler/htmlpurifier,Janson-Leung/htmlpurifier,ezyang/htmlpurifier,Janson-Leung/htmlpurifier,bfroehle/htmlpurifier,stefanotorresi/htmlpurifier,stefanotorresi/htmlpurifier,ezyang/htmlpurifier,ezyang/htmlpurifier,ezyang/htmlpurifier,r-kovalenko/htmlpurifier,Masterjoa/HTMLPurifier-standalone,bartbutler/htmlpurifier,Janson-Leung/htmlpurifier,Janson-Leung/htmlpurifier,bartbutler/htmlpurifier,stefanotorresi/htmlpurifier,bfroehle/htmlpurifier,r-kovalenko/htmlpurifier,stefanotorresi/htmlpurifier,r-kovalenko/htmlpurifier,bfroehle/htmlpurifier,bartbutler/htmlpurifier,Masterjoa/HTMLPurifier-standalone