Tests: Add makem.sh, update Makefile

Makefile

@@ -1,4 +1,23 @@
-.PHONY: test
+# * Verbosity
 
-test:
-	cask exec buttercup -L .
+# Since the "-v" in "make -v" gets intercepted by Make itself, we have
+# to use a variable.
+
+verbose = $(v)
+
+ifneq (,$(findstring vv,$(verbose)))
+	VERBOSE = "-vv"
+else ifneq (,$(findstring v,$(verbose)))
+	VERBOSE = "-v"
+endif
+
+# * Rules
+
+# Unless/until I add Cask support to makem.sh, I'm keeping this,
+# because Cask lets me run the tests with a different version of Org
+# than I have installed personally.
+cask:
+	@cask exec buttercup -L .
+
+%:
+	@./makem.sh $(VERBOSE) $(@)