Slowing sales and increased discounting sparked a downgrade from Credit Suisse on Friday for Lululemon Athletica (LULU). Other apparel retailers, Under Armour (UA) and Urban Outfitters (URBN), were upgraded by the bank. Lululemon shares tumbled 5% to below 72 in midday trading after Credit Suisse downgraded the yoga apparel company from outperform to neutral. Christian Buss, the analyst who wrote the report, lowered Lulu's price target to 80 from