Markdown file associations

markdown.plist

<dict>
    <key>CFBundleDocumentTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeMIMETypes</key>
            <array>
                <string>text/x-markdown</string>
            </array>
            <key>CFBundleTypeExtensions</key>
            <array>
                <string>md</string>
                <string>markdown</string>
                <string>mmd</string>
                <string>multimarkdown</string>
                <string>mdown</string>
                <string>mkdn</string>
                <string>mkd</string>
                <string>mdwn</string>
                <string>mdtxt</string>
                <string>mdtext</string>
                <string>mdml</string>
            </array>
            <key>CFBundleTypeName</key>
            <string>Markdown document</string>
            <key>LSItemContentTypes</key>
            <array>
                <string>net.daringfireball.markdown</string>
            </array>
            <key>CFBundleTypeRole</key>
            <string>Editor</string>
        </dict>
    </array>
</dict>