stop tracking annoying .pyc files
Add PAGE_FAULT_WRAPPER that finds_a_bug on page faults from kernelspace. close #38.
add tell_landslide_dump_stack(). fix #37.
fix spurious wrong_panics from user_panicked for shell/init/idle. fix #36.
remove student_specifics.h dependence on x86.h
Found a bug on triple fault. fix #31
cosmetic