Support usage of multiple JSX, AngularJS, and Ember blocks in an example
Support usage of multiple JSX, AngularJS, and Ember blocks in an example

This allows multiple framework blocks to be used within the same example.

For instance:
~~~
```example.jsx
<Button>First button</Button>
```
```example.html hidden
<b>More buttons</b>
```
```example.jsx
<Button>Second button</Button>
```
~~~
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