Update /ping with new get_status result hash

Render a 500 when bad plugins, so it is reported as an error to pingdom
Bump dynosaur: 0.4.2 (New #get_status)
Add specs for /ping
Fix controller specs, add missing Dynosaur config
Add missing Dynosaur.initialize in specs
Merge pull request #7 from harrystech/update_ping_route

Update /ping with new get_status result hash