TRUNK-1916 Add coveralls.io badge to readme
TRUNK-1916 Add coveralls.io badge to readme

Add coveralls.io badge to readme to show current coverage

koskedk/openmrs-core,koskedk/openmrs-core,preethi29/openmrs-core,vinayvenu/openmrs-core,vinayvenu/openmrs-core,koskedk/openmrs-core,koskedk/openmrs-core,preethi29/openmrs-core,preethi29/openmrs-core,koskedk/openmrs-core,preethi29/openmrs-core,vinayvenu/openmrs-core,vinayvenu/openmrs-core,vinayvenu/openmrs-core,koskedk/openmrs-core,preethi29/openmrs-core