See #141, #118. Fix bug in disabling beautification by language

Also add documentation on `disabledLanguages` package option

README.md

@@ -93,6 +93,11 @@ However, when beautification occurs on save then it will
 be forced to beautify the entire file's contents,
 not just selected text.
 
+- `disabledLanguages` (Default *empty array*)
+An array of Grammar names to disable beautification for.
+Note: If using the Atom's Package Settings then an array is
+represented as comma-separated string.
+
 - `muteUnsupportedLanguageErrors` (Default *false*)
 Mute only *unsupported language* errors.
 

lib/language-options.coffee

@@ -156,7 +156,7 @@ module.exports =
     unsupportedGrammar = false
     options = undefined
     if atom.config.get("atom-beautify.disabledLanguages").indexOf(grammar) > - 1
-      return
+      return beautifyCompleted(null)
     switch grammar
       # Treat JSON as JavaScript, because it will support comments.
       # And Glavin001 has tested JSON beauifying with beautifyJS.