Changelog

Bug: storage methods are not redirected to the correct implementation when type is specified

Added memo function, allowing functions to be memoized.
Added simple in memory cache that can store values against keys generated from the parameter values of memoised functions.
Added function allowing access to the original function from the memoised function.
Added function that can test for a memoised function.
Added access to a memoised functions cache.
Added simple cache management functions including clearing and listing the items in the cache.
Added a NEWS.md file to track changes to the package.
Added support for NULL return values and methods with no return value with allow.null parameter
Improved memo tests
Move hash functions to separate file adding tests

memofunc 1.0.3