Use Service Object instead model callback to send emails

Signed-off-by: Eduardo Bautista <eduardo.bautista@crowdint.com>
Create EmailService creation to let
Signed-off-by: Eduardo Bautista <eduardo.bautista@crowdint.com>
Remove unnecessary variable
Signed-off-by: Eduardo Bautista <eduardo.bautista@crowdint.com>
Merge pull request #54 from crowdint/refactor_mailer

Use Service Object instead model callback to send emails