karenc / db-migrator / 210

97%

Pull #53

travis-ci

Allow mark to accept multiple timestamps

If there is a list of migrations that needs to be marked as completed
(or not completed or deferred), we currently have to do:

```
dbmigrator mark -t 20160228212456
dbmigrator mark -t 20160228202637
```

Now it will accept a list and we can do this instead:

```
dbmigrator mark -t 20160228212456 20160228202637
```

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