Automatic update of common submodule

From bcb1518 to 211fa5f
doc: Add GstDevice* to gstreamer-sections.txt

https://bugzilla.gnome.org/show_bug.cgi?id=729440
docs: add new device probing API to docs table of contents

https://bugzilla.gnome.org/show_bug.cgi?id=729440
po: Update translations
Update .po files
Release 1.3.1
Back to development
filesrc: g_memmove() is deprecated

https://bugzilla.gnome.org/show_bug.cgi?id=712811
value: init flag mask more correctly
check: use _exit() instead of exit() in fail_unless() so we exit immediately

exit() will call atexit handlers, which may try to
clean up things or wait for things to get cleaned up,
which we don't want or need. We just want to stop
and let the parent know about the failure as quickly
as possible in case fork() is used.

Fixes timeouts on assert failures in checks where
an exit handler waits for things to stop, but they
don't stop because they haven't been shut down,
and they haven't been shut down because there's no
simple way to do so on failures.

http://sourceforge.net/p/check/patches/50/
pads: update docs for request pads

We would like to encourage the use of gst_element_request_pad()
Add new downloadbuffer element

See https://bugzilla.gnome.org/show_bug.cgi?id=680183
win32: update def
downloadbuffer: update docs
downloadbuffer: small cleanups
sparsefile: sprinkle G_BEGIN_DECLS / G_END_DECLS

for c++, and remove outdated comment, and add
new unit test to .gitignore.
sparsefile: add some Since markers to docs
plugin: fix case where gst_plugin_load_file() didn't set the error on failure
value: Add support for GObject comparising in structures

This is useful to allow comparing pool configuration where a GstAllocator
is set.

https://bugzilla.gnome.org/show_bug.cgi?id=728268
value: Add support for GstAllocationParams comparision

This is useful to compare buffer pool configuaration.

https://bugzilla.gnome.org/show_bug.cgi?id=728268