Add build script for mp4 spec.

This is a quick script to download, rename and sanitize
Yusuke Nakamura's draft for opus in the ISO Base Media File Format.

doc/build_isobmff.sh

+#!/bin/sh
+
+# Copyright (c) 2014 Xiph.Org Foundation and Mozilla Foundation
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions
+#  are met:
+#
+#  - Redistributions of source code must retain the above copyright
+#  notice, this list of conditions and the following disclaimer.
+#
+#  - Redistributions in binary form must reproduce the above copyright
+#  notice, this list of conditions and the following disclaimer in the
+#  documentation and/or other materials provided with the distribution.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+#  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+#  OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+#  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+#  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+#  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+#  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+#  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#Stop on errors
+set -e
+#Set the CWD to the location of this script
+[ -n "${0%/*}" ] && cd "${0%/*}"
+
+HTML=opus_in_isobmff.html
+
+echo downloading updates...
+CSS=${HTML%%.html}.css
+wget -q http://vfrmaniac.fushizen.eu/contents/${HTML} -O ${HTML}
+wget -q http://vfrmaniac.fushizen.eu/style.css -O ${CSS}
+
+echo updating links...
+cat ${HTML} | sed -e "s/\\.\\.\\/style.css/${CSS}/" > ${HTML}+ && mv ${HTML}+ ${HTML}
+
+echo stripping...
+cat ${HTML} | sed -e 's/<!--.*-->//g' > ${HTML}+ && mv ${HTML}+ ${HTML}
+cat ${HTML} | sed -e 's/ *$//g' > ${HTML}+ && mv ${HTML}+ ${HTML}
+cat ${CSS}  | sed -e 's/ *$//g' > ${CSS}+ && mv ${CSS}+ ${CSS}
+
+
+VERSION=$(fgrep Version ${HTML} | sed 's/.*Version \([0-9]\.[0-9]\.[0-9]\).*/\1/')
+echo Now at version ${VERSION}