Caterpillar's (CAT) stock hasn't made progress in the past two years. In 2011, the stock price lost 3%. Last year, it eased 1%. Is a comeback in the cards? With a lackluster Relative Strength Rating of 44, some might wonder why anybody would even ask the question. Two reasons: First, the Machinery-Construction Mining industry group leapt from No. 151 six weeks ago to No. 6 as of Thursday's IBD. That torrid rise alone should snare the investor's