Create initial testsuite

This creates a simple testsuite, heavily inspired by the testsuite in git.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

tests/Makefile

@@ -0,0 +1,13 @@
+
+
+T = $(wildcard t[0-9][0-9][0-9][0-9]-*.sh)
+
+all: $(T)
+
+$(T):
+	@$@
+
+clean:
+	$(RM) -rf trash
+
+.PHONY: $(T) clean