Updated Angular invoice service to query Customer invoices using QueryDisplay
Added Specs for productOption and productAttribute.
Updated Product Model Spec.
Finished product variant description in spec.
Added Specs for productOption and productAttribute.
Updated Product Model Spec.
Finished product variant description in spec.
Finished product model spec.
Added tests for Customer Models.
Added Order Models and Invoice Model Unit Tests.
Added Specs for productOption and productAttribute.
Updated Product Model Spec.
Finished product variant description in spec.
Added Specs for productOption and productAttribute.
Updated Product Model Spec.
Finished product variant description in spec.
Added tests for Customer Models.
Added notifications spec.
Merge branch 'Model-Unit-Tests' of github.com:micahh2/Merchello into Model-Unit-Tests
Patching back in missing 1.4.0-lists changes.