Exit peacefully on KeyboardInterrupt

Captured keyboardinterrupt without traceback.

Closes issue #179

coala_quickstart/coala_quickstart.py

@@ -2,6 +2,7 @@
 import logging
 import os
 import sys
+import signal
 
 from pyprint.ConsolePrinter import ConsolePrinter
 
@@ -57,13 +58,18 @@ def _get_arg_parser():
     return arg_parser
 
 
+def signal_handler(signal, frame):
+    sys.exit(0)
+
+
 def main():
     arg_parser = _get_arg_parser()
     args = arg_parser.parse_args()
 
     logging.basicConfig(stream=sys.stdout)
     printer = ConsolePrinter()
     logging.getLogger(__name__)
+    signal.signal(signal.SIGINT, signal_handler)
 
     fpc = None
     project_dir = os.getcwd()