Rename: sort_xxxx -> xxxx_sort
Do not add `list_type' and `list_node_type'
Delete `Rakefile'
Fix: pull -> shift
Be more reflective
Add `ZERO' and `ONE'
Delete unused require statement
Add `lib_io_test.F90'
Add `print_' and `print_variable' macros
Add license
Delete an unused statement
Add `.travis.yml'