Sunk by allegations it was little more than a get-rich-quick scheme, Shopify (NYSE: SHOP) had a rocky end to what was, until that point, a stellar year. It's been trading in a fairly predictable range since then, but as we start 2018, it's time for investors to get bullish on its stock, because it may be ready to resume its meteoric growth.Shopify is an e-commerce platform provider that helps small and medium-sized businesses establish web-based and mobile storefronts by giving them a simple, seamless, and secure platform from which to sell their goods and services.