Feature/receipt

Amelioration of calculating of payroll with the addition of a table to store information on vacation to avoid some of the levels of operation receipt.payslip
Only two data are directly exposed to the scope : timestamp and template; and we exposed them in the principal controller, we must avoid to do $scope.amon_payable = .... instead we must group all those property in an object which will be exposed to the scope. 

daily_rate, amont_payable, total_net ... are paymentDetail and we can do $scope.paymentDetail.daily_rate = x with that way code will have more meaning and sens