DEP-16 : Upgrade GWT 2.4.0 -> 2.5.0
PAR-225 : Improving GWT compilation speed
Put objectStore in target
PAR-226 : Configure in parent-pom surefire JVM properties to not create tests files out of target dir
Use a system property (org.exoplatform.depmgt.version) for the maven-depmgt-pom version
Upgrade maven-parent-pom -> 9-beta-1
Upgrade maven-depmgt-pom -> 2
Merge branch 'master' into feature/across-space