add temp 4_0
fix BST.h remove
complete BST remove
fix BST get
add 4_1 temp
Merge branch 'master' of https://github.com/FlyingHazi/CrackingTheCodingInterview into temp
Merge branch 'temp' of https://github.com/FlyingHazi/CrackingTheCodingInterview into temp
complete 4_1