refactor package
Revert "slight refactor of cache-control logic to be more robust"

This reverts commit 327db5a647ea0a63fd1be41e28cf7879d1e51ca7.
Revert "Merge pull request #9 from chaaz/max-age0-patch"

This reverts commit 00f25e6f3eeef0a97ff146dd5a5bcb1d9abe1111, reversing
changes made to 89f8d3c83e88aed3e9f37a71d7141ac26f5e59d8.
0.2.3