Fixing trailing slash (rebased onto develop)

[atarkowska]

This is the same as gh-4123 but rebased onto develop.

---

This fixes issue with Move to group dialog box. URLs were missing trailing slash and redirected. Redirection was blocked loading mixed active content.

GET https://trout.o.org/integration/webclient/fileset_check/chgrp?Project=191 301 MOVED PERMANENTLY
GET https://trout.o.org/integration/webclient/load_chgrp_groups?Project=191 301 MOVED PERMANENTLY
Blocked loading mixed active content "http://trout.o.org/integration/webclient/fileset_check/chgrp/?Project=..."
Blocked loading mixed active content "http://trout.o.org/integration/webclient/load_chgrp_groups/?Project=..."

URL:

url(r'^load_chgrp_groups/$',
        views.load_chgrp_groups,
        name="load_chgrp_groups"),  # Query E.g. ?Image=1,2&Dataset=3

They must be consistent. By default https://docs.djangoproject.com/en/1.6/ref/settings/#append-slash in True.

@will-moore if you want to use both you have to add:

(r'^load_chgrp_groups$', redirect_to, {'url': ...}),

cc: @sbesson @will-moore

[atarkowska]

--rebased-from #4123

[will-moore]

Since this conflicts with jstree_2015 branch #3995 I've simply cherry-picked it there: will-moore@f7dbb45
and added a comment to the description.
So you can close this and add #no-rebase to #4123.

[joshmoore]

Done.