added doc in code for check_finite
added NaN test for check_greater
added doc in code for check_greater
added NaN test for check_greater_or_equal
added doc in code for check_greater_or_equal
added NaN test for check_less
added doc in code for check_less
added NaN test for check_less_or_equal
added doc in code for check_less_or_equal
added NaN test for check_nonnegative
added doc in code for check_nonnegative
added NaN test for check_positive
added doc in code for check_positive
added NaN test for check_column_index
added doc in code for check_column_index
added NaN test for check_matching_dims
added doc in code for check_matching_dims
added NaN test for check_matching_sizes
added doc in code for check_matching_sizes
added NaN test for check_multiplicable