Updates:
        Labels: NeedsReview
        Blockedon: -1928

Comment #8 on issue 1903 by ronan.l...@gmail.com: Unify Assume keys, ask keys and ask handlers
http://code.google.com/p/sympy/issues/detail?id=1903

I've cleaned up the code, which is now ready for review in the branch
"implement-Predicate" [http://github.com/rlamy/sympy/commits/implement-Predicate].

* A predicate like Q.integer prints as 'Q.integer' and its srepr is
'Predicate("integer")'. This is a bit inconsistent because Predicate("integer") and Q.integer aren't the same object and behave differently, but I feel nevertheless that
these choices are the most intuitive.
* I've written a docstring for Predicate, but it's not in the branch submitted for review (you can see it in the branch "predicate-wip", though) since it requires a
complete refactoring of Assume's API to make sense.

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