ext/bz2/gstbz2enc.c: Accepd "ANY" caps. Use "x-bzip" instead of "x-bz2".

ext/bz2/gstbz2enc.c: Accepd "ANY" caps. Use "x-bzip" instead of "x-bz2".

Original commit message from CVS:
Reviewed by: Edward Hervey <edward@fluendo.com>
* ext/bz2/gstbz2enc.c: Accepd "ANY" caps. Use "x-bzip" instead of
"x-bz2".
* ext/bz2/gstbz2dec.c: Use "x-bzip" instead of "x-bz2". Initial
caps are "ANY".
(gst_bz2dec_chain): Configure the source pad if we can figure out
the mime type of the decompressed data.
(gst_bz2dec_[get,set]_property):
(gst_bz2dec_class_init: New property "first_buffer_size".