fixed some safety and potential perf issues#4

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zeliard wants to merge 9 commits intoaws:masterfrom

Commits on Sep 4, 2015

Commits on Sep 7, 2015

Revert "removed unused variables: stringstream's base c'tor is not cheap"
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Merge branch 'master' of https://github.com/awslabs/aws-sdk-cpp
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Commits on Sep 9, 2015

Merge branch 'master' of https://github.com/awslabs/aws-sdk-cpp
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Commits on Sep 10, 2015

*added: YetAnotherDefaultExecutior
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Commits on Nov 20, 2015

*fixed: wrong message and AWS::Region for the example
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Commits on Jan 4, 2016

Merge branch 'master' of https://github.com/awslabs/aws-sdk-cpp
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