first commit
Merge branch 'master' of https://github.com/JeffOwOSun/comp2012h-a0
implement linkedlist_internal.hpp
implement << operator; implement part of linkedlist.cpp
update main.cpp with new version from web
Implement all functions; debugging segmentation error
Correct Segmentation Fault
replace direct reference to elem_m and next_m with get_elem() and get_next()
remove ._* files and .DS_Store