Add example of events

In Events.js
Bugs at Receivables.xml and Outlet.xml fix
bug with discount fixed
Discount/markUp switch add
Issue 377, 378
Isuue 309 fix

Planned visit block if done
Check if empty OrderItem

If (Qty=0)
Add correct example of events :)
Add Settings screen.
Add example of events

In Events.js
Add correct example of events :)
Add Settings screen.
Merge branch 'develop_android' of https://github.com/BitMobile/solutions into develop_android