Merge pull request #13 from joseramonc/master

reports and rentals changes
Minor Bux Fixes, Makes PDF links on target blank, rearranges Invoices
Adds calendar on Invoices Record
Merge pull request #14 from joseramonc/master

bolita de contratos del día
Updates Invoices/Record javascript file
Merge branch 'master' of github.com:vicocamacho/SistemaRentas
lists cars properties, uses initial_car at invoices