init
fixed recurrise issue and add the loop method
added ignore file
fixed the incorrect filename
Hided the detail definition into tree_travel.h
rm stdio.h references
add rb tree definition
 renamed tree_travel.h to tree_definition.h
fixed issue1 on github
added preorder, postorder iterator, not test yet
modified the test method
fixed preorder iterator, and tested cases in cases.txt
fixed post iterator and pass all test cases in cases.txt
fixed indent
support test from a file
remove main.c