AOT compatibility enhancements (#2015)

* aot compatibility updates

- remove index files where needed
- move material dependencies to a separete module
- use aot compatible lambda functions for module export

* remove unused imports

* re-export Material module

* core module enhancements

- fix AOT issue with providers (use lambda instead of variable)
- move context menu to a separate module

* core module enhancements

* feature modules

ng2-components/ng2-alfresco-core/src/material.module.ts

@@ -18,14 +18,16 @@
 import { NgModule } from '@angular/core';
 import { MdSnackBarModule, MdToolbarModule, MdButtonModule } from '@angular/material';
 
-const MATERIAL_MODULES = [
-    MdSnackBarModule,
-    MdToolbarModule,
-    MdButtonModule
-];
+export function modules() {
+    return [
+        MdSnackBarModule,
+        MdToolbarModule,
+        MdButtonModule
+    ];
+}
 
 @NgModule({
-    imports: MATERIAL_MODULES,
-    exports: MATERIAL_MODULES
+    imports: modules(),
+    exports: modules()
 })
 export class MaterialModule {}