Merge branch 'feat/improveErrorMessages' of https://github.com/dhoko/jasmine into dhoko-feat/improveErrorMessages

- Merges #1026 from @dhoko
- Fixes #1025

src/core/formatErrorMsg.js

@@ -0,0 +1,11 @@
+getJasmineRequireObj().formatErrorMsg = function() {
+  function generateErrorMsg(domain, usage) {
+    var usageDefinition = usage ? '\nUsage: ' + usage : '';
+
+    return function errorMsg(msg) {
+      return domain + ' : ' + msg + usageDefinition;
+    };
+  }
+
+  return generateErrorMsg;
+};