Tired of the 9-to-5 grind and want a way to earn or to supplement your income? Easy. The media has named the growing trend toward micro-entrepreneurship "the Rise of the Creative Class," "the Gig Life," or "the freelance economy." All of those refer to the nearly 4 million workers who were self-employed this past year, and millions of others who currently supplement their income with freelance work. While the trend has been spotted before,...