Improve errors with the domaine and how to use the API

src/core/formatErrorMsg.js

@@ -0,0 +1,14 @@
+getJasmineRequireObj().formatErrorMsg = function() {
+
+  function generateErrorMsg(domain, usage, reco) {
+
+    var usageDefinition = usage ? 'Usage: ' + usage + '\n' : '';
+    var recoDefinition =  reco ? 'Tips: ' + reco  + '\n' : '';
+
+    return function errorMsg(msg) {
+      return domain + ' : ' + msg + '\n' + usageDefinition + recoDefinition;
+    };
+  }
+
+  return generateErrorMsg;
+};