karenc / db-migrator / 217

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travis-ci

Add db-config-ini-key to CLI options

This allows us to use the database connection string in a config file
that does not use "db-connection-string" as the key.  For example in a
config file like this:

```
[app:main]
postgresql.db-connection-string = dbname=travis user=travis host=localhost
```

dbmigrator will use this setting if
`--db-config-ini-key postgresql.db-connection-string` is passed in.

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