Included a copy of the GPL in the distribution (fixes #147).
Limit player yaw to values in the [0,360). Fixes #173.
Added .gitattributes to enforce LF line endings.
Fixed skylight in empty ChunkSnapshot sections to be 15 instead of 0.

Also, fixed logic for isSectionEmpty.
Added missing Override annotations, fixed GlowWorld and GlowPlayer line endings.
Fixed loading of blocks with high IDs.
first version of block physics
reformatting code
added notify when a block breaks/changes it's type; setting data will call the functions as well
Merge remote-tracking branch 'origin/BlockUpdates' into BlockUpdates

Conflicts:
	src/main/java/net/glowstone/block/GlowBlock.java