Sneha, Vinay | #1012 | Several changes.
1. Integrate with new visit API.
2. Change registration fee to 0 for returning patient
3. Add validation for zero registration fee and no comment

Conflicts:
	app/modules/patient/controllers/visitController.js
Vivek/Banka | #1081 | Can edit and create visit & encounter & obs based on whether the same exists or not.
Minor bug fix