Cleanup
Add Myelin reception

Vesicle:
- Add author_id attribute
- Derive HMAC key from encryption key (temporary!)
- Populate keycrypt upon encryption
- bugfixes

Synapse:
- Make reply address on received Vesicles optional to allow processing
of Vesicles from Myelin
- Decrypt encrypted Vesicles
- bugfixes

ElectricalSynapse:
- Base64-encode salt on Glia authentication
- Add parent parameter on constructor to allow access to the Synapse
that created this ESynapse
- Add polling myelin_receive method
- Automatically start myelin_receive on Persona login and registration
- bugfixes

Web_UI/views
- bugfixes