The involvement of an activist hedge fund might be what this company needs right now.The news that high-profile activist hedge fund Elliot Investment Management has built a $1 billion position in building controls and heating, ventilation, and air conditioning (HVAC) company Johnson Controls (JCI 0.87%) has sent the stock higher.While some of the moves are, no doubt, down to investors who simply looking to jump on the bandwagon, it's also a reflection that Johnson's management could do a better job of gener ...