Redefining types

Changed image type
Changed library to GD
Changed library to GD
Square algorithm stub
Loading file and tests
Load files stub
File loading ready
Changed collage.cabal , added lib
Revert "Changed collage.cabal , added lib"

This reverts commit c2cc3a76a7066d7526ef2445f6ec9b642386d996.
Simple converter to 64 colour, not reviewed