title: Back slashes in input from stdin
body: <p>In R script when stdin input is from command line, the resulting json string respresentation has back slashes. I don't understand why it's there. I have tried multiple ways to get rid of it and its still there.</p>
  
  <pre><code>getStdin &lt;- function(){
      input &lt;- file('stdin')
      jsonParts &lt;-""
      row &lt;- readLines(input, n = -1L, ok =TRUE, warn=TRUE, encoding="UTF- 8")
      jsonParts &lt;- paste(jsonParts, row,sep="", collapse=NULL)
      print(jsonParts)
      close(input)
      return (jsonParts)
     }
  
  "{\"inputs\":[{\"description\": {\"value\":13},\"name\":\"val1\",\"typename\":\"Integer\"},{\"description\":{\"value\":25},\"name\":\"val2\",\"typename\":\"Integer\"}],\"outputs\":[{\"id\":10,\"name\":\"sumResult\",\"typename\":\"Integer\"},{\"id\":11,\"name\":\"errorMsg\",\"typename\":\"String\"}],\"meta\":{\"name\":\"testSum\",\"owner\":\"samir\",\"runId\":20}}"
  </code></pre>