memory managment

New memory management 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