Registration of C++ type as GType.
Pad::set_chain_function support prototype.
Buffer is not copied if it's NULL.
Pad::chain and Pad::push functions corrected
Buffer::create_writable fixed
set_clock vfunc fixed
plugin registering test
Buffer::create_writable fixed again (didn't work poperly when buffer was copied)
gst_element_class_get_pad_template wrapped, which simplified element derivation a bit.
Added some accessors to Gst::Buffer
Corrected default retval of BaseSrc::start & stop vfuncs to true (neutral)
Don't copy buffer if RefPtr is empty.
warning fixed
appsrc and appsink enabled (what was the problem with them?)
added some unit examples