Revert "Merge pull request #1 from naps62/master"

This reverts commit 0ca982754dcc4492a521e4ae33891e09adc3f812, reversing
changes made to 1c2bf73b05e33c329108a01b492027e95c73ffac.
exception_notification 4.0 has built-in support for Resque
Merge pull request #2 from mnaberez/restore-3.0-compat

exception_notification 4.0 has built-in support for Resque