added mimetypes required for EPUB documents: .epub (zip), .opf (xml), and .ncx (xml)
added mimetypes required for EPUB documents: .epub (zip), .opf (xml), and .ncx (xml)

opf and ncx are treated as application-specific mimetypes, as listed in http://www.idpf.org/2007/opf/OPF_2.0_final_spec.html#Section2.0 (OPF) and http://www.idpf.org/2007/opf/OPF_2.0_final_spec.html#Section2.4.1.2 (NCX)

Port of revs 11101 and 11102

svn path=/stable/eXist-1.4.x/; revision=11680

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