FEATURE: Multiple embeddable hosts

- Also refactors two site settings components into one, with tests

app/assets/javascripts/admin/templates/components/url-list.hbs

@@ -1,18 +0,0 @@
-{{#if urls}}
-  <div class='urls'>
-    {{#each url in urls}}
-      <div class='url'>
-        {{d-button action="removeUrl"
-                   actionParam=url
-                   icon="times"
-                   class="btn-small no-text"}}
-        <a href="{{unbound url}}" target="_blank">{{url}}</a>
-      </div>
-    {{/each}}
-  </div>
-{{/if}}
-
-<div class='input'>
-  {{text-field value=newUrl placeholderKey="admin.site_settings.add_url"}}
-  {{d-button action="addUrl" icon="plus" class="btn-primary btn-small no-text" disabled=urlInvalid}}
-</div>

app/assets/javascripts/admin/templates/components/value-list.hbs

@@ -0,0 +1,18 @@
+{{#if collection}}
+  <div class='values'>
+    {{#each collection as |value|}}
+      <div class='value'>
+        {{d-button action="removeValue"
+                   actionParam=value
+                   icon="times"
+                   class="btn-small no-text"}}
+        {{value}}
+      </div>
+    {{/each}}
+  </div>
+{{/if}}
+
+<div class='input'>
+  {{text-field value=newValue placeholderKey=addKey}}
+  {{d-button action="addValue" icon="plus" class="btn-primary btn-small no-text" disabled=inputInvalid}}
+</div>

app/assets/javascripts/admin/templates/site-settings/host_list.hbs

@@ -0,0 +1,3 @@
+{{value-list values=buffered.value addKey="admin.site_settings.add_host"}}
+{{setting-validation-message message=validationMessage}}
+<div class='desc'>{{{unbound setting.description}}}</div>

app/assets/javascripts/admin/templates/site-settings/url_list.hbs

@@ -1,3 +1,3 @@
-{{url-list value=buffered.value}}
+{{value-list value=buffered.value addKey="admin.site_settings.add_url"}}
 {{setting-validation-message message=validationMessage}}
 <div class='desc'>{{{unbound setting.description}}}</div>