Support ranges in index operations

Standard ruby matrix:
```ruby
# :call-seq:
  #   matrix[range, range] = matrix/element
  #   matrix[range, integer] = vector/column_matrix/element
  #   matrix[integer, range] = vector/row_matrix/element
  #   matrix[integer, integer] = element
  #
  # Set element or elements of matrix.
  def []=(i, j, v)
```