porduct service functionality on estimate
Merge pull request #232 from vaibhavcisin274/vaibhav

porduct service functionality on estimate
changes application js
Merge pull request #233 from vaibhavcisin274/vaibhav

changes application js
add sum functionality estimate
Merge pull request #234 from vaibhavcisin274/vaibhav

add sum functionality estimate
Merge branch 'master' of github.com:vaibhavcisin274/invoice-project into sivanand
add mail to invoice