Added Achievements Lib and Achievements Commands for GOD in talkactions. (Use them to add/remove achievements from players)
Renamed file data/achievements.lua to data/achievements_lib.lua. Also added some info about functions included in this lib
Added the files?
Added some extra info about achievements lib
More changes to achievements_lib.lua
Added Rashid worldchange at startup.lua:
	Rashid will be created in different positions depending of day.
	If Rashid already exists in map, it should removed.
Removed Rashid worldchange from startup.lua. It was already added and I didn't noticed it.
Removed old functions
Added metatable functions
Optimized and fixed some functions
Merge pull request #914 from edumntg/master

Adding Achievements Lib and Commands. Optimized functions