Added redis capability to choose host database#5

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Commits on Mar 31, 2014

Multiple insertions of the same key-value pairs are prevented. This is accomplished using python built-in sets and redis sets
simonemainardi
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Commits on Mar 12, 2015

added python 3 compatibility and travis tests
wuan
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Commits on Mar 13, 2015

Merge pull request #1 from wuan/python3compatibility
simonemainardi
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