Version 1.4.0 of shifty backend

* Support for dynamic hours
  With dynamic hours, a work contract can have more than 0 hours
  but expected hours will still be the same as the working hours.
  This allows better resource and and shift planning because one
  can add an average value.

* Weekly report also returns paid and volunteer hours

Version 1.3.0 of shifty backend

* Support for invocation links

Version 1.2.5 of shfity backend

* Introduce invitations

Version 1.2.4 of shifty backend

* Fix for pilling period when new sales persons are created

Shifty backend version 1.2.2

* SickLeave and Holidays are not absence hours

Version 1.1.2 of shifty backend

* SickLeave and Holidays are absence hours now

Version 1.2.0 of shifty frontend

* Introduce templating

Version 1.1.1 of shifty backend

* Introduce templating
  * Billing period
  * Shiftplanner

Version 1.1.1 of shifty backend

* Introduce templating
  * Billing period
  * Shiftplanner

Version 1.1.0 of shifty backend

From last minor version:
* Introduce billing period

From last 1.0 version:
* Improve from date when generating billing period - use one day before for from values
* Fix delta hours by not taking last year values into account during caluclation.