Parallel: Don't allow reporters to be added or removed in worker processes

lib/jasmine-core/jasmine.js

@@ -1691,6 +1691,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @see custom_reporter
      */
     this.addReporter = function(reporterToAdd) {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be added via Env in parallel mode');
+      }
+
       reporter.addReporter(reporterToAdd);
     };
 
@@ -1713,6 +1717,10 @@ getJasmineRequireObj().Env = function(j$) {
      * @function
      */
     this.clearReporters = function() {
+      if (parallelLoadingState) {
+        throw new Error('Reporters cannot be removed via Env in parallel mode');
+      }
+
       reporter.clearReporters();
     };