Fixed bug where images that had been updated on the server would not be downloaded.#30

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antoinerabanes wants to merge 13 commits intojakemarsh:masterfrom

antoinerabanes:master

Commits on Aug 15, 2013

not supporting ios4.3 anymore & using weak. Also using a nsmutableurlrequest to add if-unmodified-since header field to the request
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fixed issue with the empty key
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Commits on Aug 16, 2013

updated pod spec file
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Commits on Jun 10, 2014

fixing this bloody warning :)
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Commits on Jun 23, 2014

updated the pod spec to point to the new version
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