Added a simple javascript "shim" to invoke dustjs for later use with testing

src/js/README.md

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+* Compliance Tests
+These tests run my implementation of LinkedIn's Dust and the official implementation of [LinkedIn's DustJS](https://www.dustjs.com) as compares the output to ensure they match.
+** Setup
+Install LinkedIn's DustJS in order to rust the compliance tests
+** Running
+The dustjs_shim expects a path to a template file as the first parameter, and it expects a json context over stdin. For example, to invoke it on the command line you could run:
+```sh
+cat test_cases/hello_world/input1.json | node dustjs_shim.js test_cases/hello_world/template.dust
+```

src/js/dustjs_shim.js

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+var dust = require('dustjs-linkedin');
+var fs = require('fs');
+
+var argv = process.argv.slice(2);
+if (argv.length != 1) {
+  console.error("Expecting only 1 argument (a path to a template)");
+  process.exit(1);
+}
+var context = JSON.parse(fs.readFileSync(0, 'utf-8'));
+
+try {
+  var template_source = fs.readFileSync(argv[0], 'utf-8');
+} catch (err) {
+  console.error(err);
+  process.exit(1);
+}
+
+var compiled_template = dust.compile(template_source, "tmpl");
+dust.loadSource(compiled_template);
+
+dust.render("tmpl", context, function(err, out) {
+  if(err) {
+    console.error(err);
+    process.exit(1);
+  } else {
+    console.log(out);
+    process.exit(0);
+  }
+});

src/js/test_cases/hello_world/input1.json

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+{"name": "Bob"}

src/js/test_cases/hello_world/input2.json

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+{"name": "Alice"}

src/js/test_cases/hello_world/template.dust

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+Hello {name}!