Rename open/close_adjustments routes?

[jordan-brough]

See discussion here: #321 (comment)

As of #279 we're deprecating "open" and "close" on Adjustment in general. Shall we also change the /open_adjustments and /close_adjustments routes to /finalize_adjustments and /unfinalize_adjustments?

[cbrunsdon]

I'm usually a fan of nesting resources where things make sense.

Rather then close_adjustments and unfinalize_adjustments I'd personally prefer /orders/:id/adjustments/finalize and /orders/:id/adjustments/unfinalize.

Also are we tied to finalize/unfinalize? I've decided I'm partial to "settle"/"unsettle", but mostly because I don't like the concept of "finalizing" something that is finalized.