0.5.0
Now displaying a single auction shop help for all shops
Now using a custom format to display itemstacks (nx item)
Adapted to new versioning system
Made sell inventory size editable
Fixing default presets: withdrew unsellable items
Forcing sale remove from a shop when not found in DB (avoids "ghost"
sales)
Merge branch '0.4' into 0.5

Conflicts:
	src/main/java/net/gasull/well/auction/shop/AuctionShopManager.java
NPC base implementation
Updated command usage
Redesigning sales storage in shops: only best are stored. Data is
checked everytime needed.
Now allowing decimal prices ("." as decimal)
Simplifying Houses help
Increasing default timeout which was very short
Clarify price parsing
Withdrew NPC for the moment
Shop creation on renamed items: now displaying unable message
Log fixes
Delivering 0.5.0