Decoding HTTP error messages

Since bones API endpoints error returns are standardized to return a hash containing a `message` and a `status` property, should we decode these hashes in [Admin.bones' error function?](https://github.com/developmentseed/bones-admin/blob/master/views/Admin.bones#L59).

Something like:

```
error: function(model, resp) {
var message = resp;
if (resp instanceof Object && resp.responseText) {
var obj = JSON.parse(resp.responseText);
if (obj.message) {
message = obj.message
}
}
new views['AdminGrowl']({
message: message,
classes: 'error',
autoclose: 0
});
}
```