Put together initial version of a R/singlyLinkedList package
Don't run Rscript with --vanilla so that ~/.Rprofile is lodaded and
libs in ~/.Rlibs are found.
Working on R/singlyLinkedList
Fix a bug in python/singly_linked_list_complete
Implement prime_factorization/R
Add a test to js/singly_linked_list_complete that append doesn't leave
tail incorrect.