Don't redirect to api if we want something from images dir

lib/travis/web/api_redirect.rb

@@ -4,7 +4,21 @@ class Travis::Web::ApiRedirect < Sinatra::Base
   disable :protection, :static
   set api_endpoint: 'https://api.travis-ci.org'
 
-  get '/:owner_name/:name.png' do
+  class NotPublicImages
+    Match = Struct.new(:captures)
+
+    def initialize(pattern, except)
+      @except   = except
+      @pattern  = pattern
+      @captures = Match.new([])
+    end
+
+    def match(str)
+      @captures if str =~ @pattern && str !~ @except
+    end
+  end
+
+  get NotPublicImages.new(%r{^/(\w+)/(\w+).png}, %r{^/images/}) do
     redirect!
   end
 
@@ -14,6 +28,10 @@ class Travis::Web::ApiRedirect < Sinatra::Base
 
   private
 
+    def public_image?
+      params[:owner_name] == 'images'
+    end
+
     def redirect!(path = nil)
       path = File.join(settings.api_endpoint, path || request.fullpath)
       redirect(path, 301)