Logger conflict management

+ slf4j-api 1.6.1 matching glassfish-embedded's one
+ logback 1.0.9 on wegas-app as implementation for slf4j
* glassfish embedded version increased to 3.1.2.2 to match production server
* exclude logback from tests
* increased test memory
* re-enabled liquibase on test. should use an other database for integration
- removed a lot of root logging. enable it for required package if you need to.
Merge branch 'master' of github.com:Heigvd/Wegas

* 'master' of github.com:Heigvd/Wegas:
  Fix #112	Mail duplicate
  Fix #166 no arrow to access the menu in the lobby
  Add Y.Wegas.WidgetMenu js test case
  Fix issue in GameDataSourceRest js

Conflicts:
	pom.xml
	wegas-app/pom.xml
	wegas-core/pom.xml