Parse self-references and add a test for sections.

js/test_cases/dot_reference/input1.json

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+{"names": ["Alice", "Bob", "Chris"]}

js/test_cases/dot_reference/main.dust

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+{#names}
+Hello {.}!
+{/names}

js/test_cases/sections/input1.json

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+{"things": ["Alice", "Bob", "Chris"]}

js/test_cases/sections/input10.json

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+{"things": {}}

js/test_cases/sections/input2.json

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+{"things": {"name": "Alice", "keyboard": "K-Type"}}

js/test_cases/sections/input3.json

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+{"there_are_no_things": 4}

js/test_cases/sections/input4.json

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+{"things": "just a string"}

js/test_cases/sections/input5.json

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+{"things": false}

js/test_cases/sections/input6.json

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+{"things": null}

js/test_cases/sections/input7.json

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+{"things": 0}

js/test_cases/sections/input8.json

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+{"things": ""}

js/test_cases/sections/input9.json

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+{"things": []}

js/test_cases/sections/main.dust

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+{#things}
+Thing: {.}
+{:else}
+No things
+{/things}