Angular src restructured as modular as per angular official guidelines, .travis.yml support added for node 12

src/app/core/core.module.ts

@@ -0,0 +1,10 @@
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+
+@NgModule({
+  declarations: [],
+  imports: [
+    CommonModule
+  ]
+})
+export class CoreModule { }