Allow custom mongo connection settings

[abondoa]

Some connection settings cannot (as far as I know) be set as part of the connection string. This include ssl-specific settings, such as sslCA, sslCert, sslKey, sslPass. Full list available at: http://mongodb.github.io/node-mongodb-native/2.2/reference/connecting/connection-settings/

It would be great if it was possible to specify this connection settings object to be used in a migration. My colleague has made a fork of your project and made changes to allow this: https://github.com/razvanc92/mongration/tree/connection-options

If you see this as relevant in general, we will make a pull request back to your project.

[wmartins]

@abondoa I know it's a little bit late, but it's interesting. I think a PR for that would be welcome.

However, I'm planning on review mongration code a little bit this week, maybe update it to use newer client and etc, and maybe I can rewrite to use a config object instead of a config connection string. So, maybe this review/refactor/rewrite would bring those configuration to the table.

But, I think you can open a PR to that while I'm not doing this.