Fixing deprecation warnings

Fixes some deprecation warnings in the newer versions of Resque

```
*** DEPRECATION WARNING: Resque::Worker#verbose and #very_verbose are deprecated. Please set Resque.logger.level instead
Called from: ***/.rvm/gems/ruby-2.0.0-p195@ru-bee/gems/resque-1.24.1/lib/resque/worker.rb:649:in `verbose='
```

This implementation is the same as Resque's - https://github.com/resque/resque/pull/757/files