when I try to upload a large file, localstack basically freezes (and eventually times out).  
But if the file is all `1` bytes it succeeds.

succeeds:
```bash
aws s3 --endpoint-url=http://localhost:4572 mb s3://testbucket
python -c "print '\x01'*10000000" > testfile
echo $(ls -ahl | grep testfile)
aws s3 --endpoint-url=http://localhost:4572 cp testfile s3://testbucket/testfile
```

fails:
```bash
aws s3 --endpoint-url=http://localhost:4572 mb s3://testbucket
python -c "print 'a'*10000000" > testfile
echo $(ls -ahl | grep testfile)
aws s3 --endpoint-url=http://localhost:4572 cp testfile s3://testbucket/testfile
```
so, for me, both the file content and its size determine if this triggers or not. 
I'm using the latest version `0.9.5`
bucket_name = 'test-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name, ACL='public-read')
        object_key = 'test-key-tagging'
        self.s3_client.put_object(Bucket=bucket_name, Key=object_key, Body='something')
        
        url = '%s/%s/%s' % (config.TEST_S3_URL, bucket_name, object_key)
        response = requests.get(url, verify=False)
        self.assertEqual(response.status_code, 200)
        
        self.s3_client.delete_object_tagging(Bucket=bucket_name, Key=object_key)
        
        response = requests.get(url, verify=False)
        self.assertEqual(response.status_code, 200)
        
        self._delete_bucket(bucket_name, [object_key])
    def test_delete_non_existing_keys(self):
        bucket_name = 'test-%s' % short_uid()
        self.s3_client.create_bucket(Bucket=bucket_name)
        object_key = 'test-key-nonexistent'
        self.s3_client.put_object(Bucket=bucket_name, Key=object_key, Body='something')
        response = self.s3_client.delete_objects(Bucket=bucket_name,
            Delete={'Objects': [{'Key': object_key}, {'Key': 'dummy1'}, {'Key': 'dummy2'}]})
        self.assertEqual(len(response['Deleted']), 3)
        self.assertNotIn('Errors', response)
        
        self._delete_bucket(bucket_name)
    def test_bucket_exists(self):