Adding documentation for unparse()
Adding documentation for unparse()

Fixes #19

haiyangd/xmltodict,lucius-feng/xmltodict,martinblech/xmltodict,CyberTailor/iBlock,bzamecnik/xmltodict,solvebio/xmltodict,ahlusar1989/xmltodict,CyberTailor/iBlock,pombredanne/xmltodict,martinblech/xmltodict,pombredanne/xmltodict,sporgj/xmltodict,butson/xmltodict