New tests, checkpoint descriptions and more

Today's update introduces three new tests for all users along with a range of improvements.

Big stuff

• New Favicons test - identifies pages that are missing Favicons.
• New Images test - shows what images a site uses, their alt text and sizes.
• New Server Behavior test - checks for common server issues such as missing 404 pages, and the absence of SSL.
• All Checkpoints now have helpful descriptions beneath them.

Small stuff

• Scores now update in the sidebar without refreshing the page.
• All checks for alternative text now look for 'machine generated' text that is clearly not human friendly, e.g 1324786238746723 or foo__bar--1.
• The Add website dialog is now configurable. Some customers may see more or fewer options up-front, to make it faster to add sites, or easier to configure them up front.