add AWS app tutorial to USE_CASES.md#366

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thinkingserious merged 6 commits intosendgrid:masterfrom

codevbus:create_hello_email_in_aws

Dec 1, 2017

Commits on Oct 8, 2017

Commits on Oct 22, 2017

clean up merge conflict
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Commits on Oct 24, 2017

conflict fix on PR
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Commits on Nov 4, 2017

correct upstream merge conflicts
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Commits on Dec 1, 2017

Update USE_CASES.md
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