Focus salary field if invalid input

OPEN - task 88: Create HR module 
http://github.com/DevOpsDistilled/OpERP/issues/issue/88
Add JodaTime dependency
Set values for fields

OPEN - task 88: Create HR module 
http://github.com/DevOpsDistilled/OpERP/issues/issue/88
Impl edit()

OPEN - task 88: Create HR module 
http://github.com/DevOpsDistilled/OpERP/issues/issue/88