Handle more than just StandardError-subclassed exceptions.

We want to handle ALL exceptions. Otherwise, a poorly behaved bit of code could kill a worker.  Usually, you don't want to handle all exceptions since you want to let ruby's built-in signal-handling code work (e.g. so that ctrl-c can kill a script).  We handle signals manually here, though.

lib/qless/worker.rb

@@ -78,7 +78,7 @@ def work(interval = 5.0)
 
     def perform(job)
       around_perform(job)
-    rescue => error
+    rescue Exception => error
       fail_job(job, error)
     else
       job.complete unless job.state_changed?

spec/unit/worker_spec.rb

@@ -17,13 +17,13 @@ class MyJobClass; end
         worker.perform(job)
       end
 
-      it 'fails the job if performing it raises an error' do
-        MyJobClass.stub(:perform) { raise StandardError.new("boom") }
+      it 'fails the job if performing it raises an error, including root exceptions' do
+        MyJobClass.stub(:perform) { raise Exception.new("boom") }
         expected_line_number = __LINE__ - 1
         job.should respond_to(:fail).with(2).arguments
 
         job.should_receive(:fail) do |group, message|
-          group.should eq("Qless::MyJobClass:StandardError")
+          group.should eq("Qless::MyJobClass:Exception")
           message.should include("boom")
           message.should include("#{__FILE__}:#{expected_line_number}")
         end