main: added basic connection betweeen Ods and Ceps
data: moved OdsRestHook to data package
db: added basic couchdb accessor
data: added DataSourceDb for storing registered sources
Added log4j.properties to resources
data: renamed DataListener to DataChangeListener
utils: added Log utility class
data: updated DataManager ods communication
utils: Log also supports Throwable msgs
rest: DataRestApi parses and forwards data to DataManager