added employee not found handling
Remove whitespace and add example
Merge pull request #14 from Thinkei/error-if-employee-not-found-51114977

Error handling for unknown Employee ID

[Delivers #51114977]
Remove commented code

[Refs #51286745]
Merge branch 'master' into push_employee_data_to_xero_51286745

Conflicts:
	examples/payroll_api.rb
	lib/xero_gateway/payroll/employee.rb