[merge] more plugin api documentation

[John Arbash Meinel]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Martin Pool wrote:
> I think the diff says it all.
> 
> 

BB:approve
John
=:->

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (Cygwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkl6cYEACgkQJdeBCYSNAAO4vwCghPcr3kBKSUXZBGyqQ5DYLCjT
G6AAoJ36cB9BMlCNXChNY+MrC5Rp+iB3
=Hm7v
-----END PGP SIGNATURE-----