1. add search and delete in binary search tree
2. add unittest for binary search tree
1. format the code
1. improving delete when BST dealing with root node.
2. modify avoid using call and apply style
1. fix style.
1.improving delete when BST dealing with root
2.fix style
3.more unit testing for BST
change proper variable name and clean the4 space in unit test
Merge pull request #103 from caoglish/master

 add search and delete in binary-search-tree.js