Tabajara Cache: Cache the output of pages into files

This class can be used to cache the output of pages into files.

It can check if a cache file exists and did not expire. If so, it outputs the contents of the cache file. Otherwise, the class starts capturing the output of the page.

In the end the class retrieves the just captured output of the page stores it in a cache file.

The class already compresses the output of the page that is cached.

The cache expiry time is configurable.