NodeVersion.js: factor out require('semver')
NodeVersion.js: factor out require('semver')

aptivate/etherpad-lite,aptivate/etherpad-lite,storytouch/etherpad-lite,joequant/etherpad-lite,storytouch/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,joequant/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,ether/etherpad-lite,aptivate/etherpad-lite,ether/etherpad-lite,storytouch/etherpad-lite