Calling on Los Angeles to renew its dreams and work with him to meet the challenges of making the streets safer, the schools better and the air cleaner, Antonio Ramo Villaraigosa was sworn in Friday as the city's 41st mayor and the first Latino mayor since 1872. With more than 5,000 officials and residents packed onto the South Lawn of City Hall, Villaraigosa promised to work to bring the city together and urged the public to think big about how the city can become a world leader. "Let's swear a common oath today. Let's make Los Angeles a city of...