Add Amethyst.
Merge pull request #940 from ianyh/ianyh-amethyst

Add Amethyst.
Add Knox Cask

Knox lets you easily create, access, and backup encrypted file vaults.
These vaults are great for storing large number of files of any size:
confidential documents, images, source code, application data files,
customer information.
Merge pull request #941 from ohskylab/knox

Add Knox Cask
Add Sitesucker Cask

> SiteSucker is a Macintosh application that automatically downloads
> Web sites from the Internet. It does this by asynchronously
> copying the site's Web pages, images, backgrounds, movies, and
> other files to your local hard drive, duplicating the site's
> directory structure. Just enter a URL (Uniform Resource Locator),
> press return, and SiteSucker can download an entire Web site.
Merge pull request #942 from ohskylab/sitesucker

Add Sitesucker Cask
TinyGrab Screen Shot Sharing Software

Take a screenshot and share it be sending a link to your friends.
Merge pull request #944 from johnnygoodman/tinygrab

TinyGrab Screen Shot Sharing Software