Adding a basic dynamic partials test.

js/test_cases/dynamic_partial/input1.json

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+{
+  "name": "beta"
+}

js/test_cases/dynamic_partial/main.dust

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+Testing dynamic partials{~n}
+{>"tmpl{name}"/}

js/test_cases/dynamic_partial/tmplalpha.dust

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+beta template{~n}

js/test_cases/dynamic_partial/tmplbeta.dust

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+beta template{~n}