Fixes encoding issues in generated expect script

[vStone]

We ran into encoding issues when running the installer script. This is an easy fix for the following error.

Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns: /usr/local/android/android-sdk-macosx/tools/android update sdk -u --all -t android-23  
Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/expect.rb:58:in `match': invalid byte sequence in US-ASCII (ArgumentError)
Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns:    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/expect.rb:58:in `expect'
Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns:    from /usr/local/android/expect-install-android-23:21:in `block in <main>'
Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns:    from /usr/local/android/expect-install-android-23:15:in `spawn'
Notice: /Stage[main]/Macbin::Android/Android::Platform[android-23]/Android::Package[android-23]/Exec[update-android-package-android-23]/returns:    from /usr/local/android/expect-install-android-23:15:in `<main>'
Error: /usr/local/android/expect-install-android-23 returned 1 instead of one of [0]