Sublime Text user experience

[AmjadBHD]

* If your test program reads from stdin, it could be that it did compile 
successfully but then started debugging until it reached the line where it 
waits for user input.
* What platform are you on ? Can you try replacing `shell_cmd": "nim c -g 
${file}` with `cmd": ["nim", "c", "-g", "${file}"]`.