Use RS log instead of console.error for failed requests
Use RS log instead of console.error for failed requests

We don't actually throw sync errors as errors, but this line logs them
to the console as such. One can subscribe to sync errors using the
normal RS error event.

refs #923

remotestorage/remotestorage.js,remotestorage/remotestorage.js,remotestorage/remotestorage.js,theWebalyst/remotestorage.js,theWebalyst/remotestorage.js