Added first blocks
Added all blocks (1.8)
Fixes semicolon on the end of the Enum
New methods in Material

+ JavaDocs
+ Gets maximum stack size
+ Checks gravity
Adds isSolid method

Returns true if the block is solid
New methods in Material

+ isFlammable
+ isBurnable
Add items
New methods for Items and cleanup
Little cleanup

Following the code format :smiley:
Merge pull request #1 from Nickforall/Adding-materials

Adding materials