Added Partial selection sort in Lua
Added Stooge sort
Added Floyd cycle detection algorithm
Added Brent cycle detection algorithm
Added Pollard's Rho algorithm
Added Towers of Hanoi
Added Catalan Numbers
Removed unused arg in memoize
Added Caesar Ciphering algorithm
Added ROT13 ciphering algorithm
Merge pull request #323 from Yonaba/master

Added partial selection and Stooge sort, Floyd and Brent cycle detection, Pollard's Rho, Towers of Hanoi, Catalan numbers, Caesar and ROT13 ciphering algorithms