add a cache.cache_sites() function that iterates over a list/tuple of sites and caches their values
add a cache.cache_sites() function that iterates over a list/tuple of sites and caches their values

nathanhilbert/ulmo,ocefpaf/ulmo,cameronbracken/ulmo,cameronbracken/ulmo,ocefpaf/ulmo,nathanhilbert/ulmo