move library under 'github' directory

This now aligns with the (pretty strong) golang convention of the
package name matching the path basename

README.md

@@ -2,7 +2,7 @@
 
 go-github is Go library for accessing the [GitHub API][].
 
-**Documentation:** <http://godoc.org/github.com/google/go-github>  
+**Documentation:** <http://godoc.org/github.com/google/go-github/github>  
 **Build Status:** [![Build Status](https://travis-ci.org/google/go-github.png?branch=master)](https://travis-ci.org/google/go-github)
 
 

examples/example.go

@@ -3,7 +3,7 @@ package main
 import (
 	"fmt"
 
-	"github.com/google/go-github"
+	"github.com/google/go-github/github"
 )
 
 func main() {