v4l2src: Ensure internal pool activation

Before we would hit an assertion "'gst_buffer_pool_is_active (bpool)' failed"
if the internal pool was not used to push buffer downstrea, hence not
given to the baseclass.

https://bugzilla.gnome.org/show_bug.cgi?id=732912
wavenc: Return not-negotiated if we got no caps or caps negotiation failed

And do it always, not inside a g_return_val_if_fail().

See https://bugzilla.gnome.org/show_bug.cgi?id=732939
rtspsrc: fix query leak

https://bugzilla.gnome.org/show_bug.cgi?id=733003
examples: client-rtpaux: Release reference to parent when done

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=732976
tests: fix pipeline leak in videocrop test

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=732976
v4l2bufferpool: Workaround elements not requesting any buffers

This is a workaround for element that don't request buffers when
they should.

https://bugzilla.gnome.org/show_bug.cgi?id=732288
po: Update translations
v4l2allocator: Use qdata instead of parenting to DmabufMemory

Parenting V4l2Memory to DmabufMemory was in conflict with recent
optimization in DmabufMemory to avoid dup(), and didn't work with
memory sharing. Instead, use a qdata and it's destroy notify.

https://bugzilla.gnome.org/show_bug.cgi?id=730441
Update .po files
Release 1.3.91
v4l2bufferpool: Fix copy threshold implementation

We cannot allocate new buffer in acquire, otherwise the base class
is not aware and get confused. Instead, copy in _process(). This leads
to crash on finalize.

Fixes regression, see https://bugzilla.gnome.org/show_bug.cgi?id=732912
WIP:[v4l2]add v4l2 video encoder

This encoder is orignal designed for samsung s5p-mfc encoder
at H.264 format, not done yet.
the codec_data is not need by encoder, remove it the webcamer
could work.
But this encoder encode data would have some screen mess now.
v4l2: add register of gstv4l2videoenc

This code will register gstv4l2videoenc
v4l2: modify the max encoded size

For the encoder of s5p-mfc the size is 2MB, but it is correct
for decoder which is 1MB.
v4l2: modify a debug message

As in this part only allocate buffers but not call STREAMON.