Test all *.spec files on travis

test/suite.spec

@@ -0,0 +1,15 @@
+#!/usr/bin/env zsh
+#vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
+
+local failed=false
+
+for test in **/*.spec; do
+    if [[ "${test}" == "test/suite.spec" ]]; then
+        continue;
+    fi
+    ./${test} || failed=true
+done
+
+if [[ "${failed}" == "true" ]]; then
+    exit 1
+fi