It fixed so that the return value of Found (302) of the 'disable_job' can be processed.

When 'disabled_jobs' was set up using 'jenkins-capistrano', the following exceptions occurred. 

```
jenkins-capistrano-0.0.6/lib/jenkins-capistrano/client/job.rb:30:in `disable_job': Jenkins::Client::ServerError
```

Since the cause was for the return value which cancelled 'Job' of 'Jenkins' to return 'Found(302)', it corrected the check of errors. 

I want you to take in this correction if you please. 

```
execution environments::
  OS: Linux version 2.6.32-358.2.1.el6.x86_64 
  Jenkins: 1.472
  Ruby: 1.9.3-p448
```