created blank tree.py file
this will contain the code for the tree datastructure
tree asdf
correct bug in tree
added createchild() and getchild() functions to node class; modified addnode() function in tree class
made more changes. trying to fix bug in addnode()
Merge branch 'dev' into shaan
Merge branch 'dev' of github.com:stuycs-softdev/proj2-pd7-07--twitter into dev