DEBUG in common.py dealt as str after loaded from config file

[oplier]

Hello Charles,

In my environment (Python 2.7), I found that variable DEBUG is recognized as str type instead of Bool type, after setting debug loaded from config file (".git\gitcc"):

git-cc/git_cc/common.py

Line 228 in 9db2037

DEBUG = cfg.getCore('debug', True)

Then when calling function debug, regardless of the setting value, it will enter the if case and do the print action:

git-cc/git_cc/common.py

Lines 72 to 74 in 9db2037

	def debug(string):
	if DEBUG:
	print(string)

[charleso]

@oplier Thanks for the issue, and I'm sorry the git-cc code is so horrible. :( I'm not really actively maintaining this, but if you send me a PR I will happily merge if it looks sensible.