if remote or remoteBaseUrl starts with a '/', prefix it with location.origin

[gr2m]

When my app runs at http://example.com and I run this code

var store = new Store('mydb', {
  remote: '/store/api/mydb'
})
store.sync()

Then store.sync() does not send AJAX requests to http://example.com/store/api/mydb, instead it syncs with another database in browser with the name '/store/api/mydb', which is rather confusing.

What we want is to check if the remote or remoteBaseUrl option starts with a /, and if it does, prefix it with location.origin