Add v2 support for slack service
Bump version to 1.1.1
Move slack content under text key
Bump version to 1.1.2
Add default username to slack alert
Add null check for slack username default
Bump version to 1.1.3
Raise error for v1 slack alerts
Bump version to 1.1.4
Merge pull request #53 from librato/feature/add_v2_support_for_slack

Add v2 support for slack service