TORONTO (Reuters) - Resale prices for Canadian homes rose to their highest average on record in May, while sales activity climbed for a fourth straight month as consumer confidence strengthened, according to an industry report released on Monday.But rebounding sales in some of the most expensive markets skewed the national average price, the Canadian Real Estate Association said in the report.The average home price last month rose 0.4 percent to C$319,757 ($282,971), topping the previous record ...