User can edit shortlink

- Copies over old attributes that were unedited, deletes old url and
  saves new one

- also fixed css bug on link_box
4 jobs for 25-edit-links in 1 minute and 1 second (queued for 1 second)
Status Name Job ID Coverage
  Test
passed Go-py2.7 #2258

00:00:54

passed Go-py3.4 #2259

00:00:58

passed Go-py3.5 #2260

00:00:58

passed Go-py3.6 #2261

00:01:00

73.0%