Merge pull request #347 from mitogh/master

Ackermann's function with Ruby tested with Rspec
Added Average in Python
Merge pull request #348 from wasi0013/master

Added Average in Python
added ackerman in haskell
Merge pull request #349 from NorfairKing/master

added ackerman in haskell
Added Simple Caesar Ciphering algorithm implementation
Merge pull request #350 from corpix/corpix/caesar-cipher

Added Simple Caesar Ciphering algorithm implementation