hlsdemux: Fix for URLs that contain a '/' in the query parameter

If the URL for the master manifest files contains a '/' character
in the query parameter (for example
http://example.net/1054559_h264_1500k.mp4/master.m3u8?acl=/*1054559_h264_1500k.mp4),
hlsdemux is incorrectly converting the relative URLs of the media
playlists in to absolute URLs. It is incorrectly using the last '/' it
finds in the URL. According to RFC3986 the '/' character is allowed in
the query part of the URL.

https://bugzilla.gnome.org/show_bug.cgi?id=725137
hlsdemux: Fix parsing of CODECS and RESOLUTION

hlsdemux does not check for the '"' character in #EXT-X-STREAM-INF
attributes. The CODECS parameter is an example of an attribute
that might use the '"' symbol and might contain a ',' character
inside this quoted string.

For example: CODECS="avc1.77.30, mp4a.40.2"

hlsdemux does not correctly parse the RESOLUTION attribute, it
assumes that an '=' character is used to delineate the width
and height values, but the HLS RFC states that a 'x' character
must be used as the delimiter between width and height.

https://bugzilla.gnome.org/show_bug.cgi?id=725140
docs: install prebuilt plugin docs if gtk-doc is disabled

Sync to the Makefile.am from gst-plugin-base where it is done right.
Fixes #725034
tsdemux: store global tags to push later

Keep a list of current global tags around and push them
whenever a new stream is started. Also convert all stream
specific tags to global as they are stream specific for
the container, so they are global for the streams from
within that container.

https://bugzilla.gnome.org/show_bug.cgi?id=644395
mpegtsmux: forward tags that have global scope

Instead of dropping all tag events

https://bugzilla.gnome.org/show_bug.cgi?id=644395