Migration of pos_cash to tryton 2.6 #1678
Migration of pos_cash to tryton 2.6 #1678
Merge branch 'feature/task-1678' of https://github.com/simmianand/pos_cash into feature/task-1678

Conflicts:
	cash.py
	wizards.py
Migration of pos_cash to tryton 2.6 #1678
Merge branch 'feature/task-1678' of https://github.com/simmianand/pos_cash into feature/task-1678

Conflicts:
	cash.py
Merge pull request #2 from uditagarwal/feature/task-1678

Feature/task 1678