Lyft's first-quarter results show the company is getting past its early growing pains and figuring out how to make its operations profitable.Lyft's (LYFT -1.87%) 28% year-over-year jump in Q1 revenue is a strong indication that after a full year as CEO, David Risher has the company headed in the right direction. There are four key improvements worth noting from the company's recent quarterly report.1. More revenue and free cash flowRevenue rose 28% to $1.3 billion thanks to a 21% increase in gross bookings. ...