It's been a smooth transition for Jonathan Martin with the 49ers.The former Stanford and Miami Dolphins offensive tackle -- who was constantly in the headlines last season because of his allegations of harassment by teammate Richie Incognito – has mostly flown under the radar since the Niners acquired him from the Dolphins.Now on a team with rich storylines and hopes for returning to the Super Bowl, Martin has become just a minor story: a backup tackle hoping to earn a roster spot, and possibly play guard for the first time, too.In fact, Martin said last month after organized team activities and before minicamp that he couldn't hope for a better environment to return to football."It's been great. I've got no complaints," he told Bay Area reporters. "It's a competitive environment, but everyone takes care of each other."But this week, former Dolphins linebacker Channing Crowder said Martin could have a target on his uniform this season because of what happened in Miami.Crowder, just recently retired, is now doing a radio show in South Florida, and he told David Jones of Florida Today that opponents will be tough on Martin in 2014 because of perceptions that he walked away...