Add random function in demo

1. for graph
2. for digraph
3. for btree
Add random generator function

1. random generator
2. btree_insert
Edit Print in Graph and Vertex

1.Edit Print in Graph and Vertex
2.Edit the output XML file “varList”
Fix Blank Line Problem
Fix Blank Line Problem
Merge branch 'master' of https://github.com/zmeng3/psudo into zmeng3-master
Merge branch 'zmeng3-master'