Added a confirm message for the --delete option.

diff --git a/pl.py b/pl.py
index 5ac41c0..e94e892 100755
--- a/pl.py
+++ b/pl.py
@@ -124,6 +124,11 @@ def main():
         # default auto-fix score
         if options.fix and options.score == 1:
             options.score = 0.8
+        if options.delete:
+            user_in = raw_input("Type 'delete' to confirm.\n")
+            if user_in.strip().lower() != 'delete':
+                print "Aborted."
+                exit()
         if options.delete and options.fix:
             parser.error("'delete' and 'auto-fix' are incompatible otions.")
     elif action == 'create':