Add a template to dump the parameters to a custom helper.

js/permanently_disabled_test_cases/helpers_dump_parameters/README.md

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+Chunk
+-----
+
+Some sort of object which contains an array of rendered elements. For example, using:
+
+```
+Testing dump parameters
+{#names}
+    {.}
+{/names}
+```
+
+The first interation would have `["Testing dump parameters", "Alice"]`.
+
+Question: Do any helpers read from chunk or just write to it? If its just writing, then my current architecture of just returning a `String` would work fine, though having a shared buffer thats written to would probably reduce the allocations and therefore improve performance.
+
+Context
+-------
+
+Some sort of object that contains essentially the "breadcrumbs" variable I am currently using to track the context tree. Also tracks template name, globals and options. I guess options would be that whole preserve whitespace or not option. I was just going to store this option on the dust renderer type, but I guess I should bake it into the breadcrumbs to pass into helpers if I implement support for custom helpers.
+
+Bodies
+------
+
+No idea, but based on the name I assume it contains the contents of the helper, or at least some way to render the internal body of the helper.
+
+Params
+------
+
+A mapping of the parameters directly on the helper.

js/permanently_disabled_test_cases/helpers_dump_parameters/input1.json

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

js/permanently_disabled_test_cases/helpers_dump_parameters/main.dust

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+Testing dump parameters
+{#names}
+    {.}
+    {@dumpParameters foo="bar"}
+        Internal
+    {/dumpParameters}
+{/names}