#437 pocketsphinx python gst demo not working

[Elmo Mäntynen]

src/gst-plugin/livedemo.py was not working for me, so I fixed it.

The documentation in the wiki lists an apparently earlier version for gst0.10, but the version in svn seems to be only partially ported to the gst1.0 version of the plugin. I also had to port it to GObject introspection, since no static python bindings for gst1.0 seem to be available here (Ubuntu 15.04). I tried to keep it backwards compatible to gtk2 (was easier that way).

It works now for me (python3), but I had to comment out the usage of the "Voice Activity DEtectoR" (“VADER”) element, which doesn't seem be available. No idea if that's really needed or how to replace the functionality.

I would appreciate updated documentation, or at least a link (somewhere visible) to doxygen docs generated from gstpocketsphinx.c

[Nickolay V. Shmyrev]

Applied, thanks a lot for the patch!