fix lack of skip in disqus export

app/migrator/disqus_test.go

@@ -33,7 +33,7 @@ func TestDisqus_Import(t *testing.T) {
 	assert.Equal(t, "disqus_google-74b9e7568ef6860e93862c5d77590123", c.User.ID)
 	assert.Equal(t, "89.89.89.139", c.User.IP)
 
-	posts, err := dataStore.List("test", 0)
+	posts, err := dataStore.List("test", 0, 0)
 	assert.Nil(t, err)
 	assert.Equal(t, 2, len(posts), "2 posts")
 

app/store/store.go

@@ -22,7 +22,7 @@ type Accessor interface {
 	Last(siteID string, max int) ([]Comment, error)                     // last comments for given site, sorted by time
 	User(siteID string, userID string) ([]Comment, int, error)          // comments by user, sorted by time
 	Count(locator Locator) (int, error)                                 // number of comments for the post
-	List(siteID string, limit int, skip int) ([]PostInfo, error)                  // list of commented posts
+	List(siteID string, limit int, skip int) ([]PostInfo, error)        // list of commented posts
 }
 
 // Admin defines all store ops avail for admin only