Update to pyharmony 1.0.18

[jimboca]

• Fix for new get_client method. Looks like ha_get_token is gone and token doesn't need to be passed to ha_get_client anymore

  File "./write_profile.py", line 4, in <module>
  from harmony_hub_funcs import harmony_hub_client
  File "/home/pi/Polyglot/config/node_servers/harmonyhub-polyglot/harmony_hub_funcs.py", line 2, in <module>
  from pyharmony import ha_get_token,ha_get_client
  ImportError: cannot import name ha_get_token

• Use new activity_name/activity_id instead of my existing routines.
• Pass activity_callback to get_client. The callback is called when acitivty id is changed!
• Make sure get_client times out when hub is not responding