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()
List of hashtags excludes repeats and includes current tag
Merge branch 'dev' into shaan
Merge branch 'dev' of github.com:stuycs-softdev/proj2-pd7-07--twitter into dev
added functionality so that the game ends appropriately; lists previous, not current, hashtag at end; only does this when current!=start