Merge Cycle into Walk
Update references to Cycle
Fix typo in Walk::isValid()
Make sure Walk::factoryCycleFromEdges() actually represents a cycle
Add unit tests for Walk
Document merging Cycle into Walk
Make sure cycle factories return a proper Cycle with start=end
Add tests for Walk::createGraph (~100% coverage)
Document fixed (BC) Cycle factories
Merge pull request #61 from clue/merge-cycle

Merge Cycle into Walk