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

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang