Updates:
        Blockedon: -sympy:2196 sympy:2196

Comment #2 on issue 2877 by ness...@googlemail.com: Contradictory facts about infinities in the new assumptions
http://code.google.com/p/sympy/issues/detail?id=2877

The old system is susceptible to similar problems. For example, just add the following rules to the gamma function:

def _eval_is_positive(self):
    return True

def _eval_is_negative(self):
    return True

gamma(x).is_posiitve
True
gamma(x).is_negative
False

*new session*

gamma(x).is_negative
True
gamma(x).is_positive
False

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