Changed URL for APIv2
Added support for paging subjects
Fixed typo in auth header
Updated demo program to APIv2
Updated Purge app to v2
Updated invoicing import
Removed proof of concept app for V1
Updated NuGet packages
Added support for new account properties
Added supoort for bank accounts
Updated v2 versioning and documentstion
Added v2 properties for JsonSubject
Added v2 properties for invoices
Updated documentation