Refactor API URLs to use GlobalConstants and update CORS configurations for production

jambotron-ui/src/app/services/auth.service.ts

@@ -1,8 +1,9 @@
 import { Injectable } from '@angular/core';
 import { HttpClient, HttpHeaders } from '@angular/common/http';
 import { Observable } from 'rxjs';
+import {GlobalConstants} from '../global-constants';
 
-const AUTH_API = 'http://localhost:8080/api/auth/';
+const AUTH_API = GlobalConstants.API_URL + '/auth/';
 
 const httpOptions = {
   headers: new HttpHeaders({ 'Content-Type': 'application/json' })
@@ -15,6 +16,7 @@ export class AuthService {
   constructor(private http: HttpClient) { }
 
   login(username: string, password: string): Observable<any> {
+   console.log(AUTH_API + 'signin');
     return this.http.post(AUTH_API + 'signin', {
       username,
       password