browser-plugin: fix memory leak in NP_GetMIMEDescription
Updated Greek translation
thumbnailer: Don't seek if we don't need to
thumbnailer: Exit as soon as we have an error

Rather than waiting for the thumbnailer to timeout.
thumbnailer: Fix debug output
thumbnailer: Thumbnail unseekable video files too

Rather than bail because we can't look for more interesting
frames somewhere else in the file.
thumbnailer: Fix error message mentioning audio preview
grilo: Remove drop-down source selection

We'll use a tagged entry in the future. This also adds
support for a generic "all" search.
browser-plugin: Use GtkMenuButton
grilo: Add GdTaggedEntry

From gnome-documents. Includes changes from:
https://bugzilla.gnome.org/show_bug.cgi?id=678641
grilo: Add a TotemSearchEntry

Like GdTaggedEntry but with a drop-down to select the
source provider to use.
grilo: Compile the recently added widgets
grilo: Use TotemSearchEntry for searching
grilo: Use bigger previews by default
backend: Fix incorrect property_id usage

Referer was using the user-agent property ID
backend: Check all the plugins on startup

So that we're not surprised if one is missing later.
browser-plugin: Add more OGG mime types

shared-mime-info identifies ogg media as audio/x-vorbis+ogg and
video/x-theora+ogg (easy to see in Nautilus).

I haven't seen any websites serving these MIME types, but when
loading media from local disk (quite common for OLPC shipped content)
these MIME types do come into play.

Add them to the list so that the browser plugin continues to be used
to play such media.
add Simplified Chinese (zh_CN) translation
backend: fix incorrect property ID (referrer).

Fix typo in PROP_REFERRER name.

https://bugzilla.gnome.org/show_bug.cgi?id=678796
backend: fix out-of-source build.

bacon-video-widget-enums.h is generated into the $(top_builddir)/src/backend
directory.

https://bugzilla.gnome.org/show_bug.cgi?id=678797