Update the Yammer Service hook
Update asana.rb

Also work on full Asana URLs.
Yammer service: add more notifications
Fix GitHub typo
Merge pull request #567 from yegg/patch-1

Update asana.rb
Merge pull request #566 from alfonsocora/master

Update Yammer service hook
fix default events link

/cc #568 #562
fix the regex syntax

/cc @yegg