Improves tree manager factory to work with composer autoloader
Uses composer for autoloading and PHPExcel
Improves ignoring the ext/ directory by git
Merge https://github.com/Arcavias/arcavias-core
Calls basket plugins at the end of the checkout process for last updates before saving the order
Simplifies creating tasks in setup manager
Re-adds autoloader implementation because it's still required for the extensions
Removes require statements because they conflict with composer
Adapts travis config file to composer
Improves compatibility with composer
Re-adds including setup tasks directly. Otherwise, the tests won't work
Removes composer autoloader again as it interferes with generating the JSON schemas for the ExtJS controller
Removes PHPExcel in favor of composer managed one
Fixes trailing commas for better IE support
Merge pull request #216 from nsendetzky/master

Uses composer for dependency management