Possibility to define a prefix

<a href="https://github.com/Ninos"><img src="https://avatars.githubusercontent.com/u/1012403?v=2" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [Ninos](https://github.com/Ninos)**
_Wednesday Sep 03, 2014 at 16:12 GMT_
_Originally opened as https://github.com/oyejorge/less.php/pull/167_

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Added possibility to define a prefix for the cached files.

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_**[Ninos](https://github.com/Ninos)** included the following code: https://github.com/oyejorge/less.php/pull/167/commits_