[event, server] added unit test, upgraded properties to handle autoinit of transaction and informations
[sdk] command and test implementations for connectors
[sdk] fixed gradle dependency problem
[connectors, git] fix event store (as complex events)
[connectors, git] update the file update event to manage added/deleteted lines + add a way to get tags from a specific branch
[db, commons] do not serialize transient fields in a pojo
[connectors, git] fix tag event production and add a test case
[experimental, metrics] add a project for experimental metrics
[connectors, jira] refactoring for easier and independent use of events/process connectors
[metrics, experimental] sync with Jira connector
Merge remote-tracking branch 'origin/feature-connector-sdk' into sprint

Conflicts:
	settings.gradle
[connectors, jira] the sent events now only contains partial information of the Jira issue
Merge branch 'sprint' of https://github.com/sleroy/komea into sprint

Conflicts:
	build.gradle
	modules/connectors/jira-connector/src/main/java/com/tocea/jiraconnector/core/JiraPluginConnector.java
	modules/connectors/jira-connector/src/main/java/com/tocea/jiraconnector/core/JiraServerContext.java
	modules/connectors/jira-connector/src/main/java/com/tocea/jiraconnector/service/JiraEventConnector.java
	modules/connectors/jira-connector/src/test/java/com/tocea/jiraconnector/core/JiraConnectorTest.java