eguven 10f8192c48 Add ActionFile which stores and loads DownloadActions to/from a file.
This change also replaces individual DownloadAction versions with a
single master version.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171273880
2017-10-11 12:22:49 +01:00
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