read_parquet S3 dir support
When using spark to process data and save to s3, the files are like
```bash
s3://bucket/path/_SUCCESS
s3://bucket/path/part-00000-uuid.snappy.parquet
s3://bucket/path/part-00002-uuid.snappy.parquet
s3://bucket/path/part-00001-uuid.snappy.parquet
s3://bucket/path/part-00003-uuid.snappy.parquet
``` 
It would be nice to load these files in one line.
```python
df = pd.read_parquet("s3://bucket/path")
```