New home layout with public timelines (#288)

* add dummy popup menu
* add pager to home fragment
* reduce pager sensitivity
* remove timelines from discover fragment
* add fabs to timelines
* change info banner color
* add back toolbar functionality
* update icons on navigate
* handle back press
* add lists and hashtags
* use tabs
* improve timeline title
* tweak switcher behavior
* fix show new posts button appearance
* hide show new posts button on reload
* tweak show new posts animations
* work around crash theme switch
* enable disabling federated timeline

mastodon/src/main/java/org/joinmastodon/android/api/requests/tags/GetFollowedHashtags.java

@@ -9,6 +9,10 @@ import org.joinmastodon.android.model.Hashtag;
 import java.util.List;
 
 public class GetFollowedHashtags extends HeaderPaginationRequest<Hashtag> {
+    public GetFollowedHashtags() {
+        this(null, null, -1, null);
+    }
+
     public GetFollowedHashtags(String maxID, String minID, int limit, String sinceID){
         super(HttpMethod.GET, "/followed_tags", new TypeToken<>(){});
         if(maxID!=null)