fix bundle install error

Created by: zzjin

fix issue of bundle install error after slack-notifier upgraded. upgrade to 0.3.2

Created by: jvanbaarsen

@randx Looks good to merge, relates to: https://github.com/gitlabhq/gitlabhq/commit/993831ff7daa643c2972d3e524dc4f138888d8e9

By Administrator on 2014-04-16T06:40:47 (imported from GitLab project)

By Administrator on 2014-04-16T06:40:47 (imported from GitLab)

Created by: zzjin

Wonder why ci falis?

By Administrator on 2014-04-16T06:55:17 (imported from GitLab project)

By Administrator on 2014-04-16T06:55:17 (imported from GitLab)

Created by: dzaporozhets

thanks

By Administrator on 2014-04-16T07:03:17 (imported from GitLab project)

By Administrator on 2014-04-16T07:03:17 (imported from GitLab)