Merge branch 'release/v1.4.0'

* release/v1.4.0:
  Bump version to 1.4.0
  Added checkbox field to city form type
  Added collection field for form type
  Added close option for flash messages to docs
  Docs for flash message helper
  Updated composer
  Fixed composer in gitignore
  Configuration and doc for new config options
  Moved BootstrapDemoBundle into sandbox project and changed namespace to Bc\Bundle\BootstrapDemoBundle
  Update dependencies
  Updated composer.lock
  Added composer to gitignore
Bump version, fix lessphp
Merge branch 'hotfix/v1.4.1' into develop

* hotfix/v1.4.1:
  Bump version, fix lessphp