implemented dictionary based BST
completed everything up to self balancing, need more tests
changed some test
finished insertion and bubble sort, need time testing
added size 20k time test
minor formatting
added 100k test
O(n) for a sorted list
completed merge sort
removed an if statement
added best cases time
added time test to merge_sort
added test cases
finished quick_sort.py, need time recording
finished Radix Sort, need test and time recording
wrote test for radix sort
Merge pull request #23 from corinnelhh/insert_bubble

finished tests for quick_sort, radix_sort