tests: added Calliope mini specific test app

tests/board_calliope-mini/Makefile

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+APPLICATION = board_calliope-mini
+include ../Makefile.tests_common
+
+BOARD ?= calliope-mini
+
+# This test application is for the Calliope mini only
+BOARD_WHITELIST := calliope-mini
+
+# We want to test the Calliope mini support module
+USEMODULE += mini
+
+include $(RIOTBASE)/Makefile.include

tests/board_calliope-mini/README.md

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+Background
+==========
+The Calliope mini board comes with its own little utility library, that makes
+some of the boards unique feature like the 5x5 LED matrix usable to RIOT.
+
+This test application is therefore specialized for only that board and its
+purpose is to test and showcase the board specific utility library.
+
+
+Expected result
+===============
+When running this application, you should see the string
+`Welcome RIOT @ Calliope mini!` scrolling by on the boards LED matrix.

tests/board_calliope-mini/main.c

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+/*
+ * Copyright (C) 2016 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test the Calliope mini support library
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "timex.h"
+#include "mini.h"
+
+#define DELAY           (120 * MS_IN_USEC)
+
+int main(void)
+{
+    puts("Welcome to RIOT!\n");
+    puts("Please refer to the README.md for more information about this app\n");
+
+    mini_matrix_init();
+
+    while (1) {
+        mini_matrix_shift_str("Welcome RIOT @ Calliope mini!", DELAY);
+    }
+
+    return 0;
+}