Add a basic example for encrypting and decrypting with a KMS CMK#135

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WesleyRosenblum wants to merge 3 commits intomasterfrom

Commits on Oct 25, 2019

Create keyring trace and add to encryption and decryption materials.
WesleyRosenblum
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Commits on Oct 26, 2019

Fix equals method and add tests for it.
WesleyRosenblum
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Commits on Oct 28, 2019

*Issue #, if available:* #108
WesleyRosenblum
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