EditStorageUnit
Some finishing touches
Merge pull request #5 from djhaskin987/EditStorageUnit

Edit storage unit
Add functional java
Refactor: ProductGroups -> ProductContainers
Refactor: ProductGroups -> ProductContainers
EnableMenus code complete
Merge branch 'master' into EditProductGroup

Conflicts:
	src/gui/inventory/InventoryController.java
	src/model/IProductContainer.java
	src/model/ProductContainer.java
	src/model/ProductGroup.java
	src/model/StorageUnit.java
	src/model/StorageUnits.java
Merge branch 'EnableDisableMenus'
Fixed merge
Merge branch 'master' into EditProductGroup

Conflicts:
	src/gui/inventory/InventoryController.java
	src/model/StorageUnit.java