Add `git merged commit [into]`: locate merge point

E.g. `git merged abcde dev`:

```
commit 1c3f5dd0d3c33eb9411541c8cd8aba1c3dbdf6da
Merge: a6e487b 504cbf2
Author: Bob Johnson <bjohnson@example.com>
Date:   Mon Jul 28 20:39:04 2014 -0400

    Merge pull request #123 from example/bug/fix-something/12345

    Bug/fix something/12345
```
Add `-N/--no-port` option to password manager

`password-manager -l` showed some passwords stored without port
information.  Added an option to be able to modify them.