fix(featuresloader.js): pass spec as string to createTestsFromFeature fn

All test cases now passing

fix #415

Author: ralphsaunders

lib/featuresLoader.js

@@ -23,15 +23,15 @@ const createCucumber = (
   window.cucumberJson = ${JSON.stringify(cucumberJson)};
 
   var moduleCache = arguments[5];
-  
+
   function clearFromCache(moduleId, instance){
     if(isWebpack()){
       delete require.cache[moduleId];
     } else {
       clearFromCacheBrowserify(instance);
     }
   }
-  
+
   function isWebpack(){
     return !!require.cache
   }
@@ -60,10 +60,10 @@ const createCucumber = (
           nonGlobalToRequire
             .find(fileSteps => fileSteps[filePath])
             [filePath].join("\n")}
-            
-        createTestsFromFeature('${path.basename(filePath)}', \`${jsStringEscape(
+
+        createTestsFromFeature('${path.basename(filePath)}', '${jsStringEscape(
         spec
-      )}\`);
+      )}');
         })
         `
     )