Use tabs as the canonical source indentation in git

Space conversion is done during generation only. Fixes #192

examples/base64-encoding/base64-encoding.go

@@ -11,27 +11,27 @@ import "fmt"
 
 func main() {
 
-    // Here's the `string` we'll encode/decode.
-    data := "abc123!?$*&()'-=@~"
+	// Here's the `string` we'll encode/decode.
+	data := "abc123!?$*&()'-=@~"
 
-    // Go supports both standard and URL-compatible
-    // base64. Here's how to encode using the standard
-    // encoder. The encoder requires a `[]byte` so we
-    // convert our `string` to that type.
-    sEnc := b64.StdEncoding.EncodeToString([]byte(data))
-    fmt.Println(sEnc)
+	// Go supports both standard and URL-compatible
+	// base64. Here's how to encode using the standard
+	// encoder. The encoder requires a `[]byte` so we
+	// convert our `string` to that type.
+	sEnc := b64.StdEncoding.EncodeToString([]byte(data))
+	fmt.Println(sEnc)
 
-    // Decoding may return an error, which you can check
-    // if you don't already know the input to be
-    // well-formed.
-    sDec, _ := b64.StdEncoding.DecodeString(sEnc)
-    fmt.Println(string(sDec))
-    fmt.Println()
+	// Decoding may return an error, which you can check
+	// if you don't already know the input to be
+	// well-formed.
+	sDec, _ := b64.StdEncoding.DecodeString(sEnc)
+	fmt.Println(string(sDec))
+	fmt.Println()
 
-    // This encodes/decodes using a URL-compatible base64
-    // format.
-    uEnc := b64.URLEncoding.EncodeToString([]byte(data))
-    fmt.Println(uEnc)
-    uDec, _ := b64.URLEncoding.DecodeString(uEnc)
-    fmt.Println(string(uDec))
+	// This encodes/decodes using a URL-compatible base64
+	// format.
+	uEnc := b64.URLEncoding.EncodeToString([]byte(data))
+	fmt.Println(uEnc)
+	uDec, _ := b64.URLEncoding.DecodeString(uEnc)
+	fmt.Println(string(uDec))
 }