added DoctrineMigrationBundle in order to perform the db migration
added documentation to 05-SETTING-UP-THE-DATABASE-DOCTRINE2 and performed the migration
installed the doctrine-fixtures-bundle
First commit of DataFixtures files
fixed some bug about missing importing with the use operator
fixed some bugs
Merge pull request #5 from antonio-pierro/setting-up-database

Setting up the database through doctrine2  + DoctrineMigrationBundle
Merge remote-tracking branch 'origin/master' into main-page-post-list
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