update arrivals module to use post not get for the log

[ravihansa3000]

internal reference: https://jira.nlm.nih.gov:8443/browse/PL-324

This is a matter of aesthetics that arrive 'gets' all data for the log instead of 'post'ing it.

This will tidy up the URL when a user is sitting at the arrival module for any length of time.

---

Imported from Launchpad using lp2gh.

• date created: 2012-04-05T00:13:58Z
• owner: triune
• the launchpad url was https://bugs.launchpad.net/bugs/973863