Minor clean up
Writers are synchronized
Use Streams in Graphite too
Let the user handle ClassCastException if he uses get instead of getV
Add Session.get(key, default)
Leverage SessionHook and IterationHandler to properly use Validation
Minor clean up
Use string interpolation for serializing records
DataWriter is merely a router, it should be in charge of building messages
Fix build
Refactor file messages: groups and requests, disable assertions for now
Add missing charting block
Re-enable Assertions
Fix Graphite TcpSender
Merge pull request #1077 from excilys/groups-refacto

Groups refactoring
Get rid of those crazy (Option[Group], Option[String])
Add missing build-helper-maven-plugin mgmt + misc plugin upgrades
Introduce more comparison checks, close #1078
Minor clean up
Fix build