Move tests back to 'examples', skip non-testable examples when testing.

This fixes https://github.com/sudar/Arduino-Makefile/issues/259.

script/runtests.sh

@@ -1,11 +1,31 @@
 #!/usr/bin/env bash
 
+TESTS_DIR=examples
+
 failures=()
 
-for dir in tests/*/
+# These examples cannot be tested easily at the moment as they require
+# alternate cores. The MakefileExample doesn't actually contain any source code
+# to compile.
+NON_TESTABLE_EXAMPLES=(ATtinyBlink MakefileExample TinySoftWareSerial)
+
+for dir in $TESTS_DIR/*/
 do
     dir=${dir%*/}
     example=${dir##*/}
+    example_is_testable=true
+    for non_testable_example in "${NON_TESTABLE_EXAMPLES[@]}"; do
+        if [[ $example == $non_testable_example ]]; then
+            example_is_testable=false
+            break
+        fi
+    done
+
+    if ! $example_is_testable; then
+        echo "Skipping non-testable example $example..."
+        continue
+    fi
+
     pushd $dir
     echo "Compiling $example..."
     make_output=`make clean`