* make duplicate project action available on details page
* move "weekly hours" form to main menu
* changed label of week chooser
* hide quick entries menu for punch mode users
* 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
* fix problem with empty end datetime in edit time
* fixed calendar creation with tags in "pre-defined tags" mode
* fix locale date format in report header
- show form error when trying to load invalid user
- added non-breaking space to first table cells to allow copy&paste to excel
- added several css classes to allow customizations
- remove team assignment check for user selection
