Add error handling to framework code
------------------------------------
Key: CELIX-2
URL: https://issues.apache.org/jira/browse/CELIX-2
Project: Celix
Issue Type: Task
Reporter: Jasper GielenAll functions having any chance of failure need to return a status code in order to increase the robustness of the framework and its service components. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
