v0.4: Binary file-based secrets.

This adds support for binary file-based secrets (coming in DC/OS 1.11)

v0.3: Concurrent backup and restore

This adds concurrency (parallelize backup GETs and restore PUTs/PATCHes.

Defaults to 10 concurrent HTTP sessions.

v0.2

Lot of refactoring. Also, built for both Linux and OSX (Darwin).

Initial release (1/4/2018)

v0.1

Remove test