Merge pull request #21 from johnshiver/deletion

Deletion
Merge pull request #22 from johnshiver/deletion

"Fix delete node function"
Merge pull request #23 from johnshiver/deletion

"Fix bug in tests"
Finished initial implementation of calendar challenge
Made syntax more pythonic
Add implementation of insertion sort
Add test and run times
Merge pull request #26 from johnshiver/insertion_sort_j

Insertion sort j
Updated balance tree dlete method to rebalance and fixed error in depth method