PEP8 openbazaar.py through ws.py

PEP8 clean up 3 of 3.  Orders.py has some very deeply nested dictionaries which necessitate long lines.  This situation may suggest minor future refactoring of the affected methods.
These statements are unnecessarily cluttered. Start bottom-up:
```python
bdict = {
    'buyer_GUID': self.transport.guid,
    'buyer_BTC_uncompressed_pubkey']: msg['btc_pubkey'],
...
    'buyer_order_id': order_id
}
buyer = {'Buyer': bdict}
```