Changed the auto-movement of the snake to always check with a global var before moving.

When pressing a key a variable will change and the setInterval function will always check what the current direction and then move the snake accordingly.
Added JSLint options which will ignore false errors caused by jQuery
Changed the move-function to always deleting and creating a new setInterval

It was done to remove unwanted delays when pressing a button to change direction. Unfortunately it didn't quite do the trick, needs more work.
Added a .gitignore-file to ignore annatspel.js-file which is only in the folder for reference