v0.5.4

v0.5.4

Fixes:
 - PHP session IDs: handle hash algorithms and bits per char representations

Minor changes:
 - HTTPS: support being served behing an SSL-enabled proxy
 - HTTP/Server utilities: refactor & add test coverage

Project & documentation:
 - improve/rewrite `README.md`
 - update contributor list
 - update `index.php` header
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