Added SetEventReference method

Author: niemyjski

src/EventBuilder.ts

@@ -43,6 +43,24 @@ export class EventBuilder {
     return this;
   }
 
+  /**
+   * Allows you to reference a parent event by its ReferenceId property. This allows you to have parent and child relationships.
+   * @param name Reference name
+   * @param id The reference id that points to a specific event
+     */
+  public setEventReference(name: string, id: string): EventBuilder {
+    if (!name) {
+      throw new Error('Invalid name');
+    }
+
+    if (!id ||!this.isValidIdentifier(id)) {
+      throw new Error(`Id ${this._validIdentifierErrorMessage}`);
+    }
+
+    this.setProperty('@ref:' + name, id);
+    return this;
+  }
+
   public setMessage(message: string): EventBuilder {
     if (!!message) {
       this.target.message = message;

src/ExceptionlessClient.ts

@@ -93,28 +93,28 @@ export class ExceptionlessClient {
     this.createNotFound(resource).submit(callback);
   }
 
-  public createSessionStart(userIdentity?:string, userDisplayName?:string): EventBuilder {
-    return this.createEvent().setType('session').setUserIdentity(userIdentity, userDisplayName);
+  public createSessionStart(): EventBuilder {
+    return this.createEvent().setType('session');
   }
 
-  public submitSessionStart(userIdentity?:string, userDisplayName?:string, callback?: (context: EventPluginContext) => void): void {
-    this.createSessionStart(userIdentity, userDisplayName).submit(callback);
+  public submitSessionStart(callback?: (context: EventPluginContext) => void): void {
+    this.createSessionStart().submit(callback);
   }
 
-  public createSessionEnd(userIdentity?:string, userDisplayName?:string): EventBuilder {
-    return this.createEvent().setType('sessionend').setUserIdentity(userIdentity, userDisplayName);
+  public createSessionEnd(): EventBuilder {
+    return this.createEvent().setType('sessionend');
   }
 
-  public submitSessionEnd(userIdentity?:string, userDisplayName?:string, callback?: (context: EventPluginContext) => void): void {
-    this.createSessionEnd(userIdentity, userDisplayName).submit(callback);
+  public submitSessionEnd(callback?: (context: EventPluginContext) => void): void {
+    this.createSessionEnd().submit(callback);
   }
 
-  public createSessionHeartbeat(userIdentity?:string, userDisplayName?:string): EventBuilder {
-    return this.createEvent().setType('heartbeat').setUserIdentity(userIdentity, userDisplayName);
+  public createSessionHeartbeat(): EventBuilder {
+    return this.createEvent().setType('heartbeat');
   }
 
-  public submitSessionHeartbeat(userIdentity?:string, userDisplayName?:string, callback?: (context: EventPluginContext) => void): void {
-    this.createSessionHeartbeat(userIdentity, userDisplayName).submit(callback);
+  public submitSessionHeartbeat(callback?: (context: EventPluginContext) => void): void {
+    this.createSessionHeartbeat().submit(callback);
   }
 
   public createEvent(pluginContextData?: ContextData): EventBuilder {