Job is nil when burying

[kuon]

I am not sure if this is related to #28, but we see something the following in our logs:

17:59:12 jobs.1 | /Users/amos/.gem/ruby/2.1.3/gems/beaneater-0.3.3/lib/beaneater/job/collection.rb:107:in `rescue in block in process!': undefined method `bury' for nil:NilClass (NoMethodError)
17:59:12 jobs.1 |       from /Users/amos/.gem/ruby/2.1.3/gems/beaneater-0.3.3/lib/beaneater/job/collection.rb:110:in `block in process!'
17:59:12 jobs.1 |       from /Users/amos/.gem/ruby/2.1.3/gems/beaneater-0.3.3/lib/beaneater/job/collection.rb:92:in `loop'
17:59:12 jobs.1 |       from /Users/amos/.gem/ruby/2.1.3/gems/beaneater-0.3.3/lib/beaneater/job/collection.rb:92:in `process!'
17:59:12 jobs.1 |       from /Users/amos/Dev/memoways/kura/jobs/init.rb:100:in `work'
17:59:12 jobs.1 |       from jobs/worker.rb:5:in `<main>'
17:59:12 jobs.1 | exited with code 1

I am not sure why reserve returns nil:

https://github.com/beanstalkd/beaneater/blob/master/lib/beaneater/job/collection.rb#L94

It seems this commit 109b795 moved the reserve after the begin statement, which makes exceptions raised in reserve caught by the rescue.

[nesquena]

This might be fixed by my commit (at least that line can't throw an exception now)