Added header for problem class.
Wrote first attempt at header.
Added file containing helper functions.

* One function that returns max element not on diagonal.
* One that can square all elements in a matrix. Is it needed? Couldnt
  easily find answer on google.
Found that pow will work with matrices in arma.
Fixed error in indexing (confusion rows / columns).
Added function for finding coordinates of element.
First test of class.