Clean up DanbooruService

Remove multi_get for now (broken in kio_http)
Add a default constructor (needed for QML)
Explicitly delete posts

src/libdanbooru/danbooruservice.h

@@ -95,6 +95,7 @@ private:
     QString m_password;
     QSet<QString> m_blacklist;
     DanbooruPost::Ratings m_maxRating;
+    QHash<int, DanbooruPost*> m_posts;
 
     unsigned int m_postsToFetch; // To tell when to quit
 
@@ -102,6 +103,9 @@ private:
 
 public:
 
+
+    DanbooruService(QObject *parent = 0);
+
     /**
      * @brief Construct a default instance of the service.
      *
@@ -130,8 +134,8 @@ public:
      * @param limit The number of posts to fetch (maximum 100)
      *
      **/
-    void getPostList(int page = 1, QStringList tags = QStringList(),
-                     int limit = 100);
+    Q_INVOKABLE void getPostList(int page = 1, QStringList tags = QStringList(),
+                                 int limit = 100);
 
     /**
      * @brief Get a list of pools from the board.