Bug fix for Twisted client#4

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theduderog wants to merge 5 commits intosimplegeo:masterfrom

theduderog:master

Commits on Dec 2, 2010

Fixed add_record, add_records, and delete_record methods to return results so that the twisted client can know when the request is finished and if an error occured
theduderog
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Commits on Apr 15, 2011

Commits on May 10, 2011

Better response checking on errors
theduderog
committed