The company's cash flow is blowing past expectations.Shares of website-building company Wix.com (WIX 21.59%) soared on Monday after management reported financial results for the first quarter. As of 10 a.m. ET today, Wix stock was up 19%, hitting its highest price in well over a year.Free cash flow is soaring for WixIn the first quarter, much could be said about the top and bottom lines for Wix. But I think the real story here that's exciting investors is the company's free cash flow.This profit metric look ...