Edited Issue: VS crashes when start debugging [705]

On both VS 2012 and 2013, I get the following assert followed by crash.

This is on Feb 27 build which includes new npm ui. The build is supposed to have the reverted json reference.

```
---------------------------
Assertion Failed: Abort=Quit, Retry=Debug, Ignore=Continue
---------------------------
An unhandled exception is about to terminate the process. Exception info:
System.MissingMethodException: Method not found: 'System.Collections.Generic.IEnumerator`1<Newtonsoft.Json.Linq.JToken> Newtonsoft.Json.Linq.JArray.GetEnumerator()'.

at Microsoft.NodejsTools.Debugger.Commands.ScriptsCommand.ProcessResponse(JObject response)

at Microsoft.NodejsTools.Debugger.Communication.DebuggerClient.<SendRequestAsync>d__2.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()

at Microsoft.NodejsTools.Debugger.NodeDebugger.<GetScriptsAsync>d__3a.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNon......

<truncated>
---------------------------
Abort Retry Ignore
---------------------------
```