Key TakeawaysMcDonald's reported second-quarter earnings below what analysts had projected Monday, as comparable sales declined from last year.Revenue was flat year-over-year despite analysts projecting growth, while profits fell about 12%.The chain's recent "$5 Meal Deal" promotion has reportedly provided a boost to sales, but the launch date means it will have more of an impact on third-quarter earnings. McDonald's (MCD) second-quarter earnings fell short of analysts' estimates Monday as lower foot traffi ...