Validate Email Field
Validate Email in Party Registration

Merge branch 'email-validation' into develop
Layout for Purchase Management
Add Purchases to Navigation
Remove obsolete class file
Add PurchaseDesc service
Refactor: Repackaging
Create bare Purchase Mgmt feature based upon Sale Mgmt
Impl services with required cascade update
Correct Balance update logic upon transaction
Make reference from DescRow to Desc in Business activity
Allow "New Item" when in Purchase Pane
Add Purchase feature

Merge branch 'purchase-mgmt' into develop
Add Purchase Management

Merge branch 'develop'
Merge pull request #94 from TheKojuEffect/master

Add Purchase feature