Code org: move build code into build directory, rename scripts to lib

[jrafanie]

Seen in #154

Note, we really need to move files to the right places and re-namespace things based on standard ruby conventions:

vmbuild.rb             -> build.rb
cli.rb                 -> build/cli.rb
git_checkout.rb        -> build/git_checkout.rb
kickstart_generator.rb -> build/kickstart_generator.rb
productization.rb      -> build/productization.rb
target.rb              -> build/target.rb
productization.rb      -> build/productization.rb
uploader.rb            -> build/uploader.rb

Also, rename scripts directory to lib.

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