syntax changes to minify width and improve readability; removed one too many semi colons generated by HPKP header; added mechanism to output headers as a string (and not affect headers – allow testing with PHPUnit)
syntax changes to minify width and improve readability; removed one too many semi colons generated by HPKP header; added mechanism to output headers as a string (and not affect headers – allow testing with PHPUnit)

aidantwoods/SecureHeaders