Adding in Integrity app cask.

Integrity is a mac app which scans a website for broken links, it's part of my setup enviroment.
Add link field to JustLooking Cask
Instashare Beta 9
Instacast 1.0-1718
Merge pull request #436 from fanquake/instacast-1-0-1718

Instacast 1.0-1718
Merge pull request #433 from MikeRogers0/Integrity-cask

Adding in Integrity app cask.
Merge pull request #435 from fanquake/just-looking-link

Add link field to JustLooking Cask
Merge pull request #434 from fanquake/instashare-b-9

Instashare Beta 9