Bump to Symfony 2.4 and Silex 1.1
Merge pull request #582 from nlegoff/buildenv

[3.9] Add --no-dependencies option to build-env.sh script
Add missing bootstrap less files for plugin installation
Install npm packages before running grunt task
Fix wording
Merge pull request #583 from nlegoff/setter

[3.9] Add created/updated setter consistence
Merge pull request #580 from romainneutron/symfony-2.4

[3.9] Bump to Symfony 2.4
Merge pull request #587 from romainneutron/grunt-fix

[3.9] Grunt fix
Fix paths
Add UserSetting entity