Remove the equalizer plugin, which has moved to -good

Remove the equalizer plugin, which has moved to -good

Original commit message from CVS:
* configure.ac:
* docs/plugins/Makefile.am:
* docs/plugins/gst-plugins-bad-plugins-docs.sgml:
* docs/plugins/gst-plugins-bad-plugins-sections.txt:
* docs/plugins/inspect/plugin-equalizer.xml:
* gst/equalizer/.cvsignore:
* gst/equalizer/Makefile.am:
* gst/equalizer/demo.c:
* gst/equalizer/gstiirequalizer.c:
* gst/equalizer/gstiirequalizer.h:
* gst/equalizer/gstiirequalizer10bands.c:
* gst/equalizer/gstiirequalizer10bands.h:
* gst/equalizer/gstiirequalizer3bands.c:
* gst/equalizer/gstiirequalizer3bands.h:
* gst/equalizer/gstiirequalizernbands.c:
* gst/equalizer/gstiirequalizernbands.h:
* tests/check/Makefile.am:
* tests/check/elements/.cvsignore:
* tests/check/elements/equalizer.c:
Remove the equalizer plugin, which has moved to -good