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().