Merge pull request #613 from tneotia/misc/expose-classes

Export some libs to reduce the number of imports required

Author: erickok

example/lib/main.dart

@@ -1,8 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_html/flutter_html.dart';
-import 'package:flutter_html/image_render.dart';
-import 'package:flutter_html/src/layout_element.dart';
-import 'package:flutter_html/style.dart';
 
 void main() => runApp(new MyApp());
 

lib/flutter_html.dart

@@ -1,5 +1,17 @@
 library flutter_html;
 
+//export image render api
+export 'package:flutter_html/image_render.dart';
+//export style api
+export 'package:flutter_html/style.dart';
+//export render context api
+export 'package:flutter_html/html_parser.dart';
+//export src for advanced custom render uses (e.g. casting context.tree)
+export 'package:flutter_html/src/layout_element.dart';
+export 'package:flutter_html/src/replaced_element.dart';
+export 'package:flutter_html/src/styled_element.dart';
+export 'package:flutter_html/src/interactable_element.dart';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_html/html_parser.dart';
 import 'package:flutter_html/image_render.dart';