Entrepreneurs are all too familiar with the difficulties of finding the right cofounder to help launch a startup. Two services that assisted them in meeting that challenge are now under one roof. Crowdfunding site Onevest, the New York-based parent company of CoFoundersLab, has agreed to buy its San Francisco-based rival, FounderDating, for an undisclosed price. "Finding a co-founder is really like marrying somebody," Onevest's executive chairman Alejandro Cremades told the New York Business...