Added script for teardown of database.

seasoned_api/src/database/sqliteDatabase.js

@@ -69,6 +69,15 @@ class SqliteDatabase {
       return this.execute(setupSchema);
    }
 
+   /**
+   * Tears down the database by running tearDown.sql file in schemas/.
+   * @returns {Promise}
+   */
+  tearDown() {
+    const tearDownSchema = this.readSqlFile('tearDown.sql');
+    return this.execute(tearDownSchema);
+  }
+
    /**
    * Returns the file contents of a SQL file in schemas/.
    * @returns {String}