Gino Pane 4049b6eed3 Test and prevent file import loops.
Issue: https://github.com/matthiasmullie/minify/issues/96

Updates:
- Added css files for testing and a new test-case;
- created new exception types and grouped them into separated directory;
- reuse some parts of the code.
2016-02-15 22:56:01 +03:00
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