Fixed an issue with XmlRepeater priority.

[ascirpus]

There's an issue with sendContent and run methods.
run method will traverse the array of decorators and apply each of them regardless of whether there's something to decorate at the moment within content.
If you have multiple decorators that depend one on another and one must be called after another then priority matters. In the current implementation some replacements will simply be ignored if there's nothing to replace at the moment.
This PR aims to fix that by adding a verification whether a replacement has been made and if so - reset the array and iterate through it again.

[michalcarson]

This looks interesting; thanks for taking the time to do a pull request.

I'm very interested to see the use case for this. Could you add a new paragraph to the readme.md to describe the usage of your code and provide an example?