Test view with functions from cli

Tests #717 for cli which allows use of functions in a view which is
exported javascript.

test/_files/cli_js_view_with_function.js

@@ -0,0 +1,8 @@
+module.exports = {
+  'name': 'Tater',
+  'bold': function () {
+    return function (text, render) {
+      return '<b>' + render(text) + '</b>';
+    };
+  }
+};

test/_files/cli_js_view_with_function.mustache

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+{{#bold}}Hi {{name}}.{{/bold}}

test/_files/cli_js_view_with_function.txt

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+<b>Hi Tater.</b>