feat: Adds pt_BR locale

lib/simple_moment.dart

@@ -3,9 +3,10 @@
 
 library simple_moment;
 
-export 'src/simple_moment_base.dart';
+export 'src/identifier_position.dart';
 export 'src/localedata.dart';
 export 'src/locales/de.dart';
 export 'src/locales/en.dart';
 export 'src/locales/es.dart';
-export 'src/identifier_position.dart';
+export 'src/locales/pt_br.dart';
+export 'src/simple_moment_base.dart';

lib/src/locales/pt_br.dart

@@ -0,0 +1,27 @@
+import '../identifier_position.dart';
+import '../localedata.dart';
+
+class LocalePtBr implements ILocaleData {
+  String get seconds => 'alguns segundos';
+
+  String get aMinute => 'um minuto';
+  String get minutes => '%i minutos';
+
+  String get anHour => 'uma hora';
+  String get hours => '%i horas';
+
+  String get aDay => 'um dia';
+  String get days => '%i dias';
+
+  String get aMonth => 'um mês';
+  String get months => '%i meses';
+
+  String get aYear => 'um ano';
+  String get years => '%i anos';
+
+  String get futureIdentifier => 'em';
+  String get pastIdentifier => 'atrás';
+
+  IdentifierPosition get futurePosition => IdentifierPosition.prepend;
+  IdentifierPosition get pastPosition => IdentifierPosition.append;
+}

test/simple_moment_pt_br_test.dart

@@ -0,0 +1,51 @@
+// Copyright (c) 2016, rinukkusu. All rights reserved. Use of this source code
+// is governed by a BSD-style license that can be found in the LICENSE file.
+
+import 'package:simple_moment/simple_moment.dart';
+import 'package:simple_moment/src/locales/pt_br.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Um grupo de testes', () {
+    Moment.setLocaleGlobally(new LocalePtBr());
+
+    String dateString = "2016-12-31 02:33:01.565411";
+    DateTime date = DateTime.parse(dateString);
+
+    DateTime currentDate = DateTime.parse("2016-12-31 12:00:00");
+
+    setUp(() {});
+
+    test('static Moment.parse', () {
+      expect(Moment.parse(dateString).toString() == dateString, isTrue);
+    });
+
+    test('new Moment.fromDate', () {
+      expect(new Moment.fromDate(date).toString() == dateString, isTrue);
+    });
+
+    test('Moment.from(futuro)', () {
+      DateTime compareDate = DateTime.parse("2016-12-31 12:00:30");
+      expect(
+          new Moment.fromDate(currentDate).from(compareDate) ==
+              "em alguns segundos",
+          isTrue);
+    });
+
+    test('Moment.from(passado)', () {
+      DateTime compareDate = DateTime.parse("2016-12-31 11:59:30");
+      expect(
+          new Moment.fromDate(currentDate).from(compareDate) ==
+              "alguns segundos atrás",
+          isTrue);
+    });
+
+    test('Moment.from(menos de um segundo atrás)', () {
+      DateTime compareDate = DateTime.parse("2016-12-31 11:59:59.001");
+      expect(
+          new Moment.fromDate(currentDate).from(compareDate) ==
+              "alguns segundos atrás",
+          isTrue);
+    });
+  });
+}