removed load_path business from jacobi
changed maxDiff to ruby naming convention
removed useless arg from together block
replaced pp business with a custom print_matrix method
reformatted jacobi
removed method

It's simpler to just run it in the main context
changed epsilon from global to local
improved iteration and epsilon printing
simplified jacobi calculation
renamed width and height
replace while with do while
replaced funny clone impl with create_matrix
renamed col_id and row_id to c and r
renamed max_diff to diff
fixed spacing
simplified diff calculation
renamed matrix_temp to next_matrix