Add support to email all extension developers.

zamboni.diff

diff --git a/apps/zadmin/forms.py b/apps/zadmin/forms.py
index 366e8af..5395ac2 100644
--- a/apps/zadmin/forms.py
+++ b/apps/zadmin/forms.py
@@ -37,7 +37,8 @@ class DevMailerForm(happyforms.Form):
                 ('payments',
                  'Developers of non-deleted apps (not add-ons) with payments'),
                 ('desktop_apps',
-                 'Developers of non-deleted apps supported on desktop')]
+                 'Developers of non-deleted apps supported on desktop')
+                ('all_extensions', 'All extension developers')]
     recipients = forms.ChoiceField(choices=_choices, required=True)
     subject = forms.CharField(widget=forms.TextInput(attrs=dict(size='100')),
                               required=True)
diff --git a/apps/zadmin/views.py b/apps/zadmin/views.py
index 6902059..45a32be 100644
--- a/apps/zadmin/views.py
+++ b/apps/zadmin/views.py
@@ -674,6 +674,8 @@ def email_devs(request):
                 addon__addondevicetype__device_type=amo.DEVICE_DESKTOP.id))
         elif data['recipients'] == 'sdk':
             qs = qs.exclude(addon__versions__files__jetpack_version=None)
+        elif data['recipients'] == 'addons_all':
+            qs = qs.filter(addon__type=amo.ADDON_EXTENSION)
         else:
             raise NotImplementedError('If you want to support emailing other '
                                       'types of developers, do it here!')
diff --git a/vendor b/vendor
index dbf0a86..90b5c29 160000
--- a/vendor
+++ b/vendor
@@ -1 +1 @@
-Subproject commit dbf0a86d5f0043170b1a77a9fadbb408ba4a06df
+Subproject commit 90b5c295f0c63906d8ea9434e88c15c27b5636c2