1. Added a task to do background validation for worker jobs. 2. Enabled Worker job status and Lucene index lag in dashboard home page
Minor bug fixes and updated the tile color to red for more foreground/background contrast.
Added data for more pingdom checks in the home page in addition to package restore.
Merge pull request #26 from NuGet/bhuvak-WorkerJobBackGroundchecks

More background checks for worker jobs