Allow easy editing of bookmark files

[jacobb]

This should be a good proof of concept for #8

Ideally, when viewing a list of bookmarks (possibly always with --json, and as well with a new flag --include-path) we'd also get the path of the note.

With this, we would be able to easily program not only launching a web browser to the URL, but editing the note in question

[jacobb]

Added this for json objects in v0.5.2, but still think it deserves a bit more fleshing out