Merge pull request #995 from rustyswayne/1.5.1

1.5.1 Build
Patches issue where shipment key was not being serialized with an order after lineitem repository refactoring.
Adds PoNumber to invoice missed in serialization for Examine
Adds US date format
Build 1.5.1.5
More comments on the reports controller
Merge pull request #999 from rustyswayne/1.5.2

Minor serialization patches for Examine and adds a US date format setting.
Merge branch '1.5.2' into 1.6.0

Conflicts:
	src/Merchello.Core/Models/OrderExtensions.cs