Fix RsyncTask::excludes().
Rename composer_path into composer_cmd
Add configurable composer_cmd parameter
Merge pull request #112 from edpauto/composer

Add composer_cmd as parameter for composer tasks
Add possibility for defining the composer_cmd in the global config.
Manual merge for PR #108
Merge pull request #107 from Landkeks/develop-rsync

Fix RsyncTask::excludes().
Add $preCommand
I need to set SYMFONY_ENV to prod, because of
https://github.com/symfony/symfony-standard/issues/662 .
So I add some pre command option.
I use it this way : - composer/install: {preCommand: SYMFONY_ENV=prod}