Add more Slack notifications for issue and merge request events

Stan Hurequested to merge
stanhu/gitlab-ce:add-more-slack-notifications into master

The Edit Services page now includes settings for triggering issue and merge request events. Note that only the Slack service supports these messages at the moment.

Before:

Screen Shot 2015-02-23 at 8.37.05 AM

After:

Screen Shot 2014-11-13 at 8.37.05 AM

I added an execute_services() call in the base_services.rb of both issues and merge events. Git push data objects are now distinguishable from issue/merge hook data via the object_kind entry. Please check if that is the right thing to do.

This addresses #595 (closed).

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