add daisy.png, missing from previous commit
rename mod from minetest-candy to mtcandy

This has the advantage of being short, but still
specific to minetest (as opposed to the generic 'candy').
Also, it's the same naming scheme as the dependency mod 'mtfoods'.
rename texture files to avoid conflicts
Merge pull request #1 from lathan/rename-repo

rename mod from minetest-candy to mtcandy