Added #remove_global_options
Added #remove_global_options

This fixes an issue which occurs when global options do not abort the process,
in turn remaining in the arguments array, causing an InvalidOption error when the
sub-commands options are parsed.

tj/commander,fastlane/commander,andrewvc/commander,fastlane/commander,tj/commander,commander-rb/commander,andrewvc/commander,commander-rb/commander