Version 2.1.4.0

[feature] Searching by patient ID on the homepage.
[feature] PDFs can be generated for any encounter.
[feature] Fields in an encounter can be edited.
[feature] System can be switched between imperial and metric units.
[feature] Searching on the homepage filters by current country.
[bug] Fixed not being able to update a patient's sex if it wasn't previously identified.
[development] Create a universal naming convention based on CRUD (create, retrieve, update, delete) in the service layer.
[development] Move database connection string to application.dev.conf.
[development] Interfaced the service layer mappers for better dependency control during unit testing.