See commit description

- Deprecated `sendMessage` and `sendEmoji` in favor of `send`
- (Almost) Fully integrated attachment support
- Updated tests
- General cleanup

examples/basic_usage.py

@@ -7,6 +7,6 @@ client = Client('<email>', '<password>')
 
 print('Own id: {}'.format(client.uid))
 
-client.sendMessage('Hi me!', thread_id=client.uid, thread_type=ThreadType.USER)
+client.send(Message(text='Hi me!'), thread_id=client.uid, thread_type=ThreadType.USER)
 
 client.logout()