Modification of the description of the repository class namespace

see also https://github.com/doctrine/DoctrineBundle/issues/124
Merge pull request #27 from rvgate/symfony-2.1

Updated for Symfony 2.1
Merge pull request #26 from isam/dev

Modification of the description of the repository class namespace
remove old information regarding git deps
Merge branch 'master' of git://github.com/dsyph3r/symblog-docs into symfony-2.1