set_block bug fix
server set_block fix
perf improvement in gen_chunk_buffer via reduced map_get calls
cleanup
minor fixes
check for invalid _set_block calls temporarily
Merge branch 'master' of https://github.com/fogleman/Craft into mining_crafting

Conflicts:
	main.c

Also made his things 100% less crashy
Merge branch 'master' of https://github.com/fogleman/Craft into mining_crafting

Conflicts:
	main.c