use mailcannon from ResultadosDigitais
adding airbrake
Revert "adding airbrake" (will send separete PR)

This reverts commit 3481fbf2442326e658d079093c50e353a90a8d46.
Merge pull request #1 from joaohornburg/use-mailcannon-from-resultadosdigitais

use mailcannon from ResultadosDigitais