Change cache directory to /cache/quick-cache to avoid collisions

See WebSharks/Quick-Cache#123
Change default cache directory and HTML Compressor cache directory

* Use `/cache/quick-cache/cache` for primary cache
* Use `/cache/quick-cache/htmlc` for HTML Compressor cache

See WebSharks/Quick-Cache#123
Merge branch 'quick-cache-123' into 000000-dev