Merge pull request #54 from stuart-warren/next

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Merge pull request #55 from stuart-warren/next

Increment version number
Merge pull request #56 from stuart-warren/next

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Merge pull request #57 from stuart-warren/next

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Merge pull request #59 from stuart-warren/next

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Merge pull request #60 from stuart-warren/next

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Merge pull request #65 from stuart-warren/next

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Merge pull request #68 from stuart-warren/next

Update to use jeromq 0.3.2
Merge pull request #70 from stuart-warren/next

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Prerelease v0.5.8
bump version number