Instructions to get an initial godoc running on a local app engine emulator
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To run godoc under the app engine emulator, create a ("goroot") godoc
directory that contains the app.yaml file, the doc and lib directories
from the Go distribution, as well as a godoc directory with the godoc
sources from src/cmd/godoc. In the godoc source directory, replace
main.go with init.go. The directory structure should look as follows:

godoc				// "goroot" directory
	app.yaml		// app engine control file
	doc			// goroot/doc directory
	favicon.ico
	godoc			// contains godoc sources
		godoc.go	// unchanged godoc file
		init.go		// this file instead of godoc/main.go
		...		// remaining godoc files
	lib			// goroot/lib directory

Run app engine emulator locally: dev_appserver.py -a <hostname> godoc
where godoc is the top-level "goroot" directory. The godoc home page
is then served at: <hostname>:8080 .