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_

Does less.php register php exception handler that throws exceptions? If so instead of PHP error this try catch block converts PHP error into lessc error. Good but unrelated to the pull request.