Updated Angular invoice service to query Customer invoices using QueryDisplay
Adds events to PaymentGatewayMethodBase and patches serialization issue for customerKey on InvoiceDisplay
Merge pull request #848 from rustyswayne/1.4.0

Adds events to PaymentGatewayMethodBase and patches serialization issues on InvoiceDisplay and fixes Customer Invoice View
Merge remote-tracking branch 'merchello/1.4.0' into 1.4.0
Invoice view fixes.