Deque class
Basic method is completed.
Deque method is all completed

Signed-off-by: wonjin <wonjin92@naver.com>
operator << , >>
Befor load , save method
After Point << , >> operator work
Merge branch 'Point' into Deque
load method is completed.

Signed-off-by: wonjin <wonjin92@naver.com>
print() return type is fixed.
save is completed.

Signed-off-by: wonjin <wonjin92@naver.com>
include <fstream> removed.