Revert "Merge pull request #172 from robmiller/feature/contacts/slack"

This reverts commit 795f1da4429fc4d59c2c5b587748549247dc3324, reversing
changes made to 5fad099e1513ac53d02a0b6d7b16aae638d8f20b.

Conflicts:
	lib/god/contacts/slack.rb