Insert command and autoload path
finish script to import migrations files

The migrations files are searched in __bundle_path__/Resources/migrations OR in the path defined by the 'migration-source' directory in the extra package information defined in package's composer.json file.

The script check whether file exists in the app/DoctrineMigrations dir. If yes, the two files are compared using a md5 hash. If the hash is not equal, the script ask user for a confirmation to copy them. If the files are equal, they are ignored.

If the files are not present, or if the human behind the computer confirmed the import, the migration files are copied into app/DoctrineMigrations directory.
add comment to Migrations method
add .gitignore to app/DotrineMigrations directory
import migration feature into master

Conflicts:
	app/DoctrineMigrations/.gitignore
	composer.json