ha-sort-diff-file Sort files

Ensure that the checksum files are sorted and uniq'd before
diff sees them.

This ensures, for example, when the user has

```yaml
cache:
bundler: true
directories:
- 'vendor/bundle'
```

the we do not have multiple checksums of the identical files.

Hiro Asari avatar Hiro Asari

Push event #181 passed

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The .travis.yml file used for this job is not available
Build Config
{
  "rvm": [
    "1.9.3",
    "2.1.5"
  ],
  "sudo": false,
  "script": [
    "bundle exec rspec spec"
  ],
  "language": "ruby"
}