Lessc: watch changes imported files

<a href="https://github.com/dkrnl"><img src="https://avatars.githubusercontent.com/u/734622?v=2" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [dkrnl](https://github.com/dkrnl)**
_Tuesday Jul 29, 2014 at 03:55 GMT_
_Originally opened as https://github.com/oyejorge/less.php/pull/153_

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_**[dkrnl](https://github.com/dkrnl)** included the following code: https://github.com/oyejorge/less.php/pull/153/commits_