Make businessId attribute of BusinessDesc
Make BusinessDesc identifier for DescRow
Add IdClass for BusinessDescRow
Make Item field Id along with businessDesc
Annotate with IdClass
Remove IdClass definitions
Create separate id as an identifier for descRow
Basic init() method execution

OPEN - task 86: Create Business(Sales-Purchases) Module 
http://github.com/DevOpsDistilled/OpERP/issues/issue/86
Employ new model for Business-Module compos

Merge branch 'iss86-business-module' into sale-mgmt