&& in attributes breaks compression

```
What steps will reproduce the problem?
1. Write HTML that has to use && (eg: Angular)
2. Try to run the compressor on it.
3. Note that you have missing code, weird quotation marks, etc.

What is the expected output? What do you see instead?

I expect && to appear in my attributes and for the rest of the code to compress
nicely. Instead, the parser seems to be totally confused.

What version of the product are you using? On what operating system?

0.1.2 via middleman-minify-html 3.4.0
```

Original issue reported on code.google.com by `Smokejum...@gmail.com` on 26 Dec 2014 at 8:17