LOTS of changes to properly handle post/topic revisions

FIX: history revision can now properly be hidden
FIX: PostRevision serializer is now entirely dynamic to properly handle
hidden revisions
FIX: default history modal to "side by side" view on mobile
FIX: properly hiden which revision has been hidden
UX: inline category/user/wiki/post_type changes with the revision
details
FEATURE: new '/posts/:post_id/revisions/latest' endpoint to retrieve
latest revision
UX: do not show the hide/show revision button on mobile (no room for
them)
UX: remove CSS transitions on the buttons in the history modal
FIX: PostRevisor now handles all the changes that might create new
revisions
FIX: PostRevision.ensure_consistency! was wrong due to off by 1
mistake...
refactored topic's callbacks for better readability
extracted 'PostRevisionGuardian'

lib/guardian/post_revision_guardian.rb

@@ -0,0 +1,23 @@
+# mixin for all Guardian methods dealing with post_revisions permissions
+module PostRevisionGuardian
+
+  def can_see_post_revision?(post_revision)
+    return false unless post_revision
+    return false if post_revision.hidden && !can_view_hidden_post_revisions?
+
+    can_view_edit_history?(post_revision.post)
+  end
+
+  def can_hide_post_revision?(post_revision)
+    is_staff?
+  end
+
+  def can_show_post_revision?(post_revision)
+    is_staff?
+  end
+
+  def can_view_hidden_post_revisions?
+    is_staff?
+  end
+
+end