FIX: Properly encode string literals in hbs compiler

lib/javascripts/widget-hbs-compiler.js.es6

@@ -11,7 +11,12 @@ function sexp(value) {
     let result = [];
 
     value.hash.pairs.forEach(p => {
-      result.push(`"${p.key}": ${p.value.original}`);
+      let pValue = p.value.original;
+      if (p.value.type === "StringLiteral") {
+        pValue = JSON.stringify(pValue);
+      }
+
+      result.push(`"${p.key}": ${pValue}`);
     });
 
     return `{ ${result.join(", ")} }`;

script/test_hbs_compiler.rb

@@ -3,7 +3,7 @@ template = <<~HBS
   {{a}}
   {{{htmlValue}}}
   {{#if state.category}}
-    {{attach widget="category-display" attrs=(hash category=state.category)}}
+    {{attach widget="category-display" attrs=(hash category=state.category someNumber=123 someString="wat")}}
   {{/if}}
 HBS