Be able to pass the --target through the phonegap-cli

Related to the pull request in apache/cordova-ios#107

cordova-ios passes --target to ios-sim as --devicetypeid so that you can emulate on difference devices from the CLI.  This change makes it possible to do something like:

phonegap install ios --target "iPhone-5" --emulator
phonegap install ios --target "iPhone-6" --emulator
phonegap install ios --target "iPhone-6-Plus" --emulator

which as far as I can tell is not currently possible in phonegap version 3.5.0-0.21.17