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fix svg with viewBox and width, height in #62

In the demo, formula is rendered without `over` symbol in Chrome. It didn't happen in Firefox. ![image](https://user-images.githubusercontent.com/19898639/50945640-34997e00-14c8-11e9-90e4-0c75f7429a55.png) instead of [firefox] ![image](https://user-images.githubusercontent.com/19898639/50945677-601c6880-14c8-11e9-9b14-5327465d958e.png)

With this code ``` import 'package:flutter/material.dart'; import 'package:flutter_svg/flutter_svg.dart'; const String svgString = ''' '''; void main() { runApp(MaterialApp( home: Scaffold( body: Center( child: SvgPicture.string( svgString, ), ), ), )); }...

## Steps to Reproduce Go to camera Screen in the demo ## Expected results The camera opens fast as default camera lib from flutter ## Actual results There is delay...