* bump composer packages
* fixes#5329 quotes for ANSI_MODE
* improve year selection
* improve year selection via dropdown
* added range selector in month-picker
* fix week number if week starts with sunday
* fix first day of month in URL
* predefined options for week chooser
* z-index issue with sticky table header
* replace duplicated translations
* add logout button to allow user switch without having to re-login in "remember me" login
* new flag to detect if invoice entry is a fixed rate
* improve export column lengths
* added service methods with events to delete customer, project, activity
* added API endpoints to delete customer, project, activity
* added tests for new API endpoints
* added serializer attributes for API usage
* new setters to fill invoice data from fixture
* re-usable fixture helper methods
* added API endpoints to fetch invoices
* adjust tests
* improve report visibility
* fix timesheet duration, which breaks validation
* added contributing section in README
* do not allow to change project for existing activities - fixes#2576
* bump theme version to fix FOSUserBundle dependency
* use entity color instead of inherited one - fixes#2200
- refactored admin controller and templates
- plugin support for entity actions
- changed column mail to email in customer table
- refactored theme events
