Preliminary DynamoDB update expression support#37

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amcp wants to merge 3 commits intojava-json-tools:masterfrom

Commits on Aug 18, 2016

json patch now generates ExpressionSpec for DynamoDB UpdateItem
cm-alexp
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Commits on Aug 19, 2016

implemented attribute_exists condition on replace operations
cm-alexp
committed

Commits on Aug 30, 2016

condition remove operations on path exists
cm-alexp
committed