Added option to migrate attachments and set labels based on project name

[ksuther]

I know this project hasn't been touched in a few years, but I found it really helpful in doing a migration.

I added a couple of other options for migrating attachments (as links back to the original Redmine repository) and project names.

[pdurbin]

@ksuther cool. You could probably become the maintainer, if you want to. I'd suggest forking it if you want. Then we could update the README on the IQSS side to point to your fork.

[ksuther]

I did fork it to make these changes, but I'm just doing a drive-by single shot usage of this (like most people, I imagine).

I figured I'd send a PR to try to leave things in a bit better shape than I found them though :)

[pdurbin]

@ksuther that's cool. Thanks.