Happy new year

Added invoicing, ledger and other ERP stuff.

v1.0-beta.4

Fixed glitch in file upload for machine and added tip to migrator

Old Halloween

v1.0-beta.3

Close #24

v1.0-beta.2.1

Refactored user choice in appointment to select control

v1.0-beta.2: Close #21

Nice to have

First Beta Release

v1.0-beta.1

Added interval attribute