Add tier to org model
Merge pull request #22 from pjmuller/app_item_count

Added Podio::Item.item_count
Added layouts property to application model
Added method for retrieving contract prices
Check for nothing
Reapply lost changes
Handle nil quantity
Add contract period model
Moar properties
Add contract property
Added method for making external free
Add new price attributes
Add method to get the tier prices for a contract
Make this work
Go back to the old calculated methods for the simulation to work
Add method for creating an invoice
additional tag methods
Merge branch 'extra_tag_methods' into elsa
tag delete tweak