Added to python rayeval module function hand_rank_str which returns string representation of the rank,
possible return values are: high card, one pair, two pair, three of a kind, straight, flush, full house,
four of a kind, straight flush.

Exmaple:

In [3]: rayeval.hand_rank_str('omaha', 'Ah Kc Qc Jd 2s', 'Ad Ks 7h 6d')
Out[3]: 'two pair'

In [4]: rayeval.hand_rank_str('omaha', 'Ah Kc Qc Jd 2s', 'Ad 3s 7h 6d')
Out[4]: 'one pair'

In [5]: rayeval.hand_rank_str('omaha', 'Ah Kc Qc Jd 2s', 'Ac 3c 7h 6d')
Out[5]: 'one pair'

In [6]: rayeval.hand_rank_str('omaha', 'Ah Kc Qc Jd 2s', 'Ac 3c 7c 6d')
Out[6]: 'one pair'

In [7]: rayeval.hand_rank_str('omaha', 'Ah Kc Qc Jc 2s', 'Ac 3c 7c 6d')
Out[7]: 'flush'