Change debug flag to D instead of d.

d would be useful for --dry-run.

bin/ansible-playbook

@@ -33,7 +33,7 @@ def main(args):
     # create parser for CLI options
     parser = OptionParser()
     parser.usage = "ans-playbook playbook.yml ..."
-    parser.add_option('-d','--debug', default=False, action="store_true",
+    parser.add_option('-D','--debug', default=False, action="store_true",
         help='enable standard error debugging of modules.')
     parser.add_option('-f','--forks', dest='forks', default=C.DEFAULT_FORKS, type='int',
         help='set the number of forks to start up')