Updated patch for Asterisk 12.2.0

Updated for 12.2.0, removed VP8 passthrough parts since this is already part of 12.2.0.
Updated readme for 12.2.0 version
Updated readme some more.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Updated readme some more.
  Updated readme for 12.2.0 version
  Updated patch for Asterisk 12.2.0

Conflicts:
	README.md
	asterisk-11.1.2-opus+vp8.patch