title: Passing multi line string in a Graphql mutation
body: <p>Newbie to <code>GraphQL</code>. </p>
  
  <p>I have to pass a <code>multiline</code> string (verbatim) inside a <code>mutation</code>. I have to read back the text in a seperate application and save it as a text file. </p>
  
  <p>Here is what I am trying to do. I am trying this using <code>GraphiQL</code> client talking to a testing server in <code>GraphCool</code>. </p>
  
  <pre><code>mutation {
    createMessage(fullName: "John K", 
      message: "some very long text
  message that appears on multiple lines 
  with line breaks."    
  }
  </code></pre>
  
  <p>And I get this error </p>
  
  <pre><code>{
  "error": "Syntax error while parsing GraphQL query. Invalid input \"\"some very long text\\n\", expected StringValue, BooleanValue, NullValue, Variable, Comments, ObjectValue, EnumValue, NumberValue or ListValue (line 6, column 13):\n    message: \"some very long text\n            ^"
  }
  </code></pre>
  
  <p>I can resolve the issue by replacing all line breaks with \n.</p>
  
  <pre><code>mutation {
    createMessage(fullName: "John K", 
      message: "some very long text\nmessage that appears on multiple\nlines\nwith line breaks."    
  }
  </code></pre>
  
  <p>However, I am not sure though if it is the right approach because when I read back the message text and view it as a text file line breaks do not appear and all I get are \n.  </p>
  
  <p>Please help... </p>