Fix ordering of execution result & console output

[DonJayamanne]

Sample code:

var abc = 1234;
console.log('Hello World');
abc

The output should be:

Hello World
1234

But sometimes we get

1234
Hello World

Solutions:

• Solution 1:
  • Once execution has been completed, write to console with special GUID console.log(GUID)
  • Then send execution result
  • At extension end, wait for GUID before we add the execution result