go/doc, godoc: show methods of anonymous fields
go/doc, godoc: show methods of anonymous fields

Missing: Handling of embedded interfaces.

Also, for reasons outlined in the previous CL (5500055), embedded
types have to be exported for its "inherited" methods to be visible.
This will be addressed w/ a subsequent CL.

R=r, rsc
CC=golang-dev
http://codereview.appspot.com/5502059

gnanderson/go,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,gnanderson/go,apparentlymart/golang,dsriram/golang,pombredanne/go-deleteme,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,apparentlymart/golang,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,gnanderson/go,gnanderson/go,dsriram/golang,dsriram/golang,apparentlymart/golang,tv42/old-go,apparentlymart/golang,gnanderson/go,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,dsriram/golang,tv42/old-go,apparentlymart/golang