This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.
Some confusion came up in #9 over the proper way to extract TLDs from
hostnames. This should hopefully alleviate that.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=118417091