U.S. RESEARCH ROUNDUP-D.R. Horton, Humana, Chicago Bridge & Iron

July 22 (Reuters) - Wall Street securities analysts revised their ratings and price targets on several U.S.-listed companies, including Adeptus Health, Chipotle Mexican Grill and Yadkin Financial, on Friday. HIGHLIGHTS * Chicago Bridge & Iron Co : Baird cuts to neutral * D.R. Horton Inc : BofA Merrill cuts to neutral from buy * Humana Inc : Wolfe Research raises to outperform * Community Bank System Inc : Sandler O'Neill cuts to