Flowing Blocks

Added:

 - Asphalt! Craft it with a bucket, two clay, a coal, and a gravel. When dried, full asphalt blocks will give you a speed boost!

 - Ice and Slime fluids! Ice is slippery, though due to the way slipperiness works only large ice flows will actually cause you to slip. Slime is a little slippery too, as well as bouncy like a slime block!

Changed:

 - Cement recipe. Instead of a bucket of water, it now requires an extra block of sand. This should make it a bit more convenient, since you don't need another bucket just to add water anymore.