// Build ------ 20150719 ------ BundleVersion ------ internal
Bundle version is the internal version number of your app.
// Version ------ 1.8.3 ------ BundleVersionString,Short ------ public
Short version string is the publically visible version of your app.
// sample
Safari Version 8.0.7 (10600.7.12)
XCode Version 6.4 (6E35b)
iOS Simulator Version 8.4 (SimulatorApp-565.9
Finder version 10.10.5
OS X Yosemite Version 10.10.4 (14E46)
原文：http://huangchao.blog.51cto.com/10446378/1676096