Fix provider fallbacks for non dev networks

This now checks if frame or a local node is running and else uses infura
to connect to the ethereum network.
Now you can use all the helpers for the testnets/mainnet without running
anything (in readonly mode)

truffle.js

@@ -28,7 +28,7 @@ const providerForNetwork = (network) => (
         let [first, ...rest] = network;
         preset = `infura${first.toUpperCase()}${rest.join('')}`;
       }
-      return provider('frame', 'local', preset);
+      return provider(['frame', 'local', preset]);
     }
   }
 )