Reference previous status correctly
Merge pull request #760 from robbydyer/master

Previous_occurrence not correctly referencing status
[previous_occurrence] test previous occurrence, occurrence incrementation
[previous_occurrence] wait another second, travis is slow
Merge pull request #763 from portertech/hotfix/previous_occurrence

test previous occurrence, occurrence incrementation
patch level bump, 0.13.1, fixed event occurrence count
Update travis.yml.
Set version requirements for development dependencies.
Add Sensu::Socket characterization tests.
refactor protocol handler.
more protocol handler cleanup.