Starting work on testcase framework

- Started building a unit test case framework with Linked Lists.
Continuing work on building unit tests.
Continung work on building unit tests
Merge branch 'master' of https://github.com/waynewbishop/SwiftStructures
New test cases

- Built new cases for data structures.
Refactored test architecture

- Consolidated data structure tests to a single class.
Building test cases for the factory classes.
Starting work on test cases for the factory classes
Refining test cases
Organied test files
Starting work on the unit test cases for the graph algorithms
Added helper test function to check for neighbor association
Added function for reversing the path sequence
Merge remote-tracking branch 'origin/master'