HeaderMap (CaseInsensitiveDict) __init__ missing

Originally reported by: space one (Bitbucket: spaceone, GitHub: spaceone)

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missing __init__:

def __init__(self, *args, **kwargs):
    d = dict(*args, **kwargs)
    for key, value in iteritems(d):
        dict.__setitem__(self, str(key).title(), value)

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• Bitbucket: https://bitbucket.org/cherrypy/cherrypy/issue/1231

[rozuur]

Have added above missing init accordingly.