Added datepicker
Merge pull request #407 from Bladrak/datepicker

Added datepicker
dateOfBirth not required

was lost in a recent updade, restored
updating "impersonate user" icon

getting rid of older icons
Merge pull request #416 from net02/patch-2

updating "impersonate user" icon
Merge pull request #415 from net02/patch-1

dateOfBirth not required in UserAdmin
Merge remote-tracking branch 'sonata-project/master'