"user" is a restricted keyword in postgres

Resolves following issues :

+ [ZF-Commons/ZfcUser#435](https://github.com/ZF-Commons/ZfcUser/issues/435)

+ [ZF-Commons/ZfcUserDoctrineORM#77](https://github.com/ZF-Commons/ZfcUserDoctrineORM/issues/77)
Merge branch 'release/v-0.1'