Remove old database migrations; add missing ones

android-base/src/main/java/org/isoron/androidbase/storage/BaseSQLiteOpenHelper.java

@@ -76,4 +76,10 @@ public class BaseSQLiteOpenHelper extends SQLiteOpenHelper
             throw new RuntimeException(e);
         }
     }
+
+    @Override
+    public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion)
+    {
+        throw new UnsupportedDatabaseVersionException();
+    }
 }

android-base/src/main/java/org/isoron/androidbase/storage/UnsupportedDatabaseVersionException.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2017 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+package org.isoron.androidbase.storage;
+
+public class UnsupportedDatabaseVersionException extends RuntimeException
+{
+}