Fixed #14: Fix off-by-one error when checking pruning throttling counter for cache_disk. (#15)
Closed #13: Added documentation for the remove() method.
cache_mem() and cache_disk() now allow - and _ (hyphen and underscore) characters in the keys. (#9)
cache_disk() previously did not correctly throttle pruning. (#11)
Closed #4: Sped up pruning for cache_mem. (#5)
Fixed cache_mem pruning with evict="lru".