Fix bug editing item prices.
Updated Payment schema; updated tests.  Fixes #121.
Merge branch 'hotfix/payment_attributes' into develop

Conflicts:
	omod/src/test/webapp/resources/js/start-tests.js
	omod/src/test/webapp/resources/js/test-data.js
Merge branch 'develop' of github.com:OpenHMIS/openmrs-module-openhmis.cashier into develop