Added set to download/install/cache the android sdk tools for signing release builds

node_modules/tunnel/test/keys/ca3.cnf

@@ -0,0 +1,17 @@
+[ req ]
+default_bits           = 1024
+days                   = 9999
+distinguished_name     = req_distinguished_name
+attributes             = req_attributes
+prompt                 = no
+output_password        = password
+
+[ req_distinguished_name ]
+C                      = JP
+OU                     = nodejs_jp
+CN                     = ca3
+emailAddress           = koichik@improvement.jp
+
+[ req_attributes ]
+challengePassword              = A challenge password
+