Update slack to fix issues with ruby 1.9.3
Update to fix ruby 1.9.3 issue with slack-notifier
 Merge branch 'master' into 'master'

Issue 155: Slack-notifier update to fix 500 errors

Slack-notifier 0.2.0 is broken for Rails 1.9.3

This update bumps the Gemfile/Gemfile.lock to use 0.3.2 version of the gem file to correct the issue.

slack-notifier changelog addressing the issue

https://github.com/stevenosloan/slack-notifier/blob/master/changelog.md

Issue 155 about the error

https://gitlab.com/gitlab-org/gitlab-ce/issues/155