dash: Remove obsolete README.

https://bugzilla.gnome.org/show_bug.cgi?id=738848

ext/dash/README

@@ -1,35 +0,0 @@
-dashdemux
-
-GStreamer plugin allowing the playback of MPEG DASH streams.
-
-The plugin is based on some basic objects defined in the GStreamer HLS
-Demux plugin from the gst-plugins-bad module.
-
-Minimum requirements:
-- glib 2.32.1
-- gstreamer 0.10.36
-- gst-plugins-base 0.10.36
-- gst-plugins-good 0.10.31
-- gst-plugins-bad 0.10.23
-
-The following patches need in addition to be applied:
-
-isomp4 (from gst-plugins-good):
-https://bugzilla.gnome.org/show_bug.cgi?id=677535
-https://bugzilla.gnome.org/show_bug.cgi?id=678767
-https://bugzilla.gnome.org/show_bug.cgi?id=678772
-
-decodebin2 (from gst-plugins-base):
-https://bugzilla.gnome.org/show_bug.cgi?id=685938
-
-To build gst-dashdemux:
-./autogen.sh
-./configure
-./make
-sudo make install
-
-To launch gst-dashdemux:
-
-gst-launch playbin2 uri=http://www-itec.uni-klu.ac.at/ftp/datasets/mmsys13/redbull_4sec.mpd
- 
-gst-launch playbin2 uri=http://download.tsi.telecom-paristech.fr/gpac/DASH_CONFORMANCE/TelecomParisTech/mp4-main-multi/mp4-main-multi-mpd-AV-BS.mpd