Added merge sort in GAP.
Merge pull request #224 from sebasguts/master

Added merge sort in GAP.
Added several implementation for fibonacci sequence in GAP.
Merge pull request #225 from Yonaba/master

Added Depth Limited Search in Lua and refactored previous code
Merge pull request #226 from sebasguts/master

Added several implementation for fibonacci sequence in GAP.
Merge pull request #227 from Yonaba/master

Iterative Deepening Depth First Search
Added Knapsack in Lua