v0.2.0

v0.2.0

• Structure of tasks refactored in PR #17, "symfony:console" command
  replaces "symfony:command"
• Commands are only run on servers with release role
• symfony_env_prod variable renamed to symfony_env
• app_path is now passed to the build_bootstrap task to allow custom directory
  `structures (ezpublish)
• symfony_env is now set correctly for stages other than the default

Thanks to @blaugueux, @mstrzele @patrickli, @kingcrunch & @Nifty for their contributions