1.8.0

• [cygnus-twitter][bug] Fix wrong data in spec file (#1407)
• [cygnus-ngsi][hardening] Add complex configuration examples (#629)
• [cygnus-ngsi][bug] Fix NGSIMySQLSink when persisting bulks of rows with different number of columns (#1409)
• [cygnus-ngsi][feature] Add metadata storing in NGSIMongoSink (#1156)
• [cygnus-ngsi][hardening] Set transaction and correlation IDs to 'N/A' when there is no activity (#1175)
• [cygnus-ngsi][hardening] Pre-aggregate batches in NGSISTHSink (#1359)
• [cygnus-ngsi][hardening] Change the name of historic-related enabling parameters (#1314)
• [cygnus-ngsi][bug] Fix NotifyContextRequest.ContextAttribute.toString(), removing double quote for attribute values (#1430)
• [cygnus-ngsi][bug] Add support for file channels (#1419)
• [cygnus-ngsi][hardening] Add a document about reliability (#1433)
• [cygnus-common, cygnus-ngsi][hardening] Fix FIWARE repository URL (#1435)
• [cygnus-common, cygnus-ngsi][hardening] Unify test classes (#1332, #1333)
• [cygnus-common][bug] Allow disabling YAFS in order to avoid crashes upon configuration reloads (#1074)
• [cygnus-ngsi][hardening] Add a note about optional channels when using Flume's ReplicatingChannelSelector (#510)
• [cygnus-ngsi][hardening] Improve HDFS sink logs (#1358)
• [cygnus-ngsi][hardening] Add CygnusError base class (#1441)