[STDIN] Allow scripts to receive user input during runtime

Hi,

Currently, Atom Script works very well for quickly checking the output of a program within the editor. However, programs may often require user input, and it seems that Atom Script does not allow for the user to type input and send it to a program when the program requests it.

For instance, the following Python 2 code never finishes but instead hangs, waiting for the user to provide input which cannot be typed anywhere.

``` python
name = raw_input('What is your name? ')
print 'Hello, ' + name + '.'
```

Therefore, I think the ability to pass user input to a program on runtime is a well-needed feature. Any possibility of adding this?

Thanks,
Caleb