Adapted installers to next version of install bundle
Merge branch 'master' of https://github.com/claroline/CoreBundle into install-refactoring

Conflicts:
	Library/Installation/AdditionalInstaller.php
Updated dependencies
Renamed operation file after install/update
Merge pull request #75 from stefk/install-refactoring

Install refactoring
Fixed update command
Fixed quotes and translations of widget names
Replaced old logos by new ones
Added logo/icon step in the updater
Used a default platform config