Added docs for the new image bloc

lib/src/blocs/new_image_bloc.dart

@@ -9,12 +9,24 @@ import '../services/auth_service.dart';
 import '../resources/firebase_storage_provider.dart';
 import '../resources/firestore_provider.dart';
 
+/// A business logic component that manages the state for the new image screen.
 class NewImageBloc {
+  /// An instance of the auth service.
   final AuthService _auth = authService;
+
+  /// An instance of the firestore provider.
   final FirestoreProvider _firestore = firestoreProvider;
+
+  /// An instance of the firebase storage provider.
   final FirebaseStorageProvider _storage = storageProvider;
+
+  /// A subject of the current picture file.
   final _picture = BehaviorSubject<File>();
+
+  /// A subject of the current user model.
   final _user = BehaviorSubject<UserModel>();
+
+  /// A subject of the current task event name.
   final _eventName = BehaviorSubject<String>();
 
   NewImageBloc() {
@@ -22,22 +34,34 @@ class NewImageBloc {
   }
 
   //Stream getters.
+  /// An observable of the picture file.
   Observable<File> get picture => _picture.stream;
+
+  /// An observable of the user model.
   Observable<UserModel> get userModelStream => _user.stream;
+
+  /// An observable of the task event name.
   Observable<String> get eventName => _eventName.stream;
+
+  /// An observable of the ready to submit flag.
   Observable<bool> get submitEnabled =>
       Observable.combineLatest2(_picture, _eventName, (a, b) => true);
 
   //Sink getters.
+  /// Changes the current picture file.
   Function(File) get changePicture => _picture.sink.add;
+
+  /// Changes the current task event name.
   Function(String) get changeEventName => _eventName.sink.add;
 
+  /// Fetches and updates the current user.
   Future<void> setCurrentUser() async {
     final user = await _auth.currentUser;
     final userModel = await _firestore.getUser(username: user.email);
     _user.add(userModel);
   }
 
+  /// Saves the current picture to the database.
   Future<void> submit() async {
     final user = _user.value;
     final StorageUploadTask uploadTask =