Delete v1.0

Delete implemented. Linear tests seem to work!

TODO: Fix the count issue… Check should be inside recursive method.
Delete v1.1

Major bug fixes.
Delete v1.11

Minor style changes.
Test framework updated
v2.0

Implemented:
- Insert
- Contains
- Count
- Clear
- Delete
- Copy Constructor
v2.1

Implementation of assignment operator and tests
v2.11

Moved tree verification into private
v2.12

Implemented debug string