Merge pull request jedi4ever#1002 from manics/kickstart_files_typo

VirtualBox build fails, `handle_kickstart': undefined method `kickstartfiles'

Author: mpapis

lib/veewee/provider/core/box/build.rb

@@ -225,7 +225,7 @@ def handle_kickstart(options)
 
           case definition.kickstart_file
           when Array  then kickstartfiles = definition.kickstart_file
-          when String then kickstartfiles = definition.kickstartfiles.split
+          when String then kickstartfiles = definition.kickstart_file.split
           when nil    then kickstartfiles = []
           else raise "Do not know how to handle kickstart_file: #{kickstart_file.inspect}"
           end