Add static gzip file support, where a gzip file with a matching name but adding .gz to the end can be served up to clients that support it.  As part of that, changed the code so the Content-Type and Content-Length are sent even for an HTTP HEAD request.
Updated the README to describe gzip configuration
Remove in-memory cache
Fix check for acceptEncoding header to work if there is no accept-encoding header
Fix check for acceptEncoding header to work if there is no accept-encoding header
Fix error with accept-encoding heaer check.  Fix bug where Content-Length was sent with a 304 not modified response.
Fixed merge issues
Fixed more merge issues
Updated syntax for ext. library (mime)
Fixed mime lookup. It's not necessary to only pass in the file extension
Reverted header check back to original, so we handle one or both of 'If-None-Match' and 'If-Modified-Since' correctly.