store the last response in the api - in a similar way to lastReqest#3

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DavidGoodwin wants to merge 3 commits intophillipsdata:masterfrom

DavidGoodwin:master

Commits on Sep 21, 2015

store the last response in the api - in a similar way to how lastRequest() is already
DavidGoodwin
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Merge remote-tracking branch 'upstream/master'
DavidGoodwin
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Commits on Sep 25, 2015

Follow redirects - namecheap seem to do this when everything breaks - e.g redirect to /PredefinedResponses/500-UnhandledException.xml?aspxerrorpath=/xml.response - otherwise we do not get XML back
DavidGoodwin
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