* new memory features:

** now supports using full system memory, ignoring the heap memory limit (usually 1.5GB)
** cache can now be managed by size in bytes
** now detects available memory, and manually triggers garbage collection if enabled with `node --expose-gc`
** zlib memory compression is used unless disabled
** memory is freed up by Least Recently Used when necessary

NOTE:
* all values must now be basic types (stirngs, arrays, etc) or other JSON serializble objects