Deprecate --name attribute

https://github.com/doctrine/DoctrinePHPCRBundle/issues/137
Update LoadFixtureCommand.php

Clean up messy if statements
Update LoadFixtureCommand.php

Throw deprecated error when using --name and ignore the option.
Deprecate --session and make it an alias of dm
Add --dm and help text for it
Merge pull request #138 from lucasgranberg/master

Deprecate --name attribute