refractor: self service module (#291)

* Refractor components.
* Improve responsiveness of components.
* Add task management component.
* Add users data resolver.
* Add relative router links.
* Replace mat-icons by font-awesome icons.
* Add comments.

Fixes #290

src/app/self-service/users/users.resolver.ts

@@ -0,0 +1,33 @@
+/** Angular Routes */
+import { Injectable } from '@angular/core';
+import { Resolve } from '@angular/router';
+
+/** rxjs Imports */
+import { Observable } from 'rxjs';
+
+/** Custom Services */
+import { UserService } from './user.service';
+
+/** Custom Model */
+import { User } from './user.model';
+
+/**
+ * Self service users data resolver.
+ */
+@Injectable()
+export class UsersResolver implements Resolve<Object> {
+
+  /**
+   * @param {UserService} userService Self service user service.
+   */
+  constructor(private userService: UserService) {}
+
+  /**
+   * Returns the users data.
+   * @returns {Observable<User[]>}
+   */
+  resolve(): Observable<User[]> {
+    return this.userService.getUsers();
+  }
+
+}