Database and model now support images
Changed from using ordernumber as identifier in imagetable and product
tables
Added gson lib
Created IServerLayer and ServerLayer.
Merge branch 'dev-serverlayer' of ssh://git@github.com/Farenheight/Lidkoping-SH.git into dev-serverlayer
Added ProductType to database and model. 
Fixed some errors with image in database.
Merge branch 'dev' into dev-serverlayer

Conflicts:
	src/se/chalmers/lidkopingsh/database/OrderDbStorage.java
Merge
Added delete to producttype commented for better understanding
Fixes to update with a collection of orders in database
Fixed libs
Fixed libs
Added javadoc and som comments to database classes and ILayer
Fixed a typo in javadoc
Fixed misinterpretation in javadoc