1.6.13

* Fix forward-slashed paths on Windows. Thanks to @etiago
* Fix CSS URL detector to match quotes correctly. Thanks to @vskh
* Add a compiler_options dict to compile, to allow passing options to custom compilers. Thanks to @sassanh
* Verify support for Django 1.11. Thanks to @jwhitlock

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Bump version to 1.6.8

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Bump version to 1.6.6.

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