nginx: support nginx on the regression tests and have all the tests working/passing.

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Depends on #634

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Depends on #635

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Depends on #637

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Depends on #638

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Under development at branch: https://github.com/SpiderLabs/ModSecurity/tree/nginx_regression

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By 6325ed8 we had 167 tests failing.

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By 2a43589 we have 30 tests failing.

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Depends on #643

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By 3cf1701 we have 13 malfunctioning tests

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Depends on: #645

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By fe14d9d everything is working like a charm.