'unescape' option

Added 'unescape' option to prevent escaping some special charcters.
If file has tags like this:
---
<input type="hidden" ng-model="model" ng-init="model='<?php echo $ugly_php_variable; ?>' ">
---
It turn into:
---
<input type="hidden" ng-model="model" ng-init="model=&apos;&lt;?php echo $ugly_php_variable; ?&gt;&apos;''">
---