Lesson 5 - Fish
Lesson 6 - Dominator
Lesson 6 - EquiLeader
Change ruby version to 1.9.1
Change Ruby version back to 1.9.3

Codility run Ruby 1.9.1, but well, that version sucks, so I am
switiching back to he 1.9.3
Lesson 7 - MaxDoubleSliceSum
Lesson 7 - MaxProfit
Lesson 7 - MaxSliceSum
Lesson 8 - MinPerimeterRectangle
Lesson 8 - Peaks