Update composer.json

This is needed otherweise I have a lot of strange errors...
Merge pull request #40 from bakura10/patch-1

Update composer.json
Updating dependency to doctrine-orm-module with the newly tagged versions

Reverts a8fb27630c1c5ca106d5e8818b703ce523b4811c
Merge pull request #42 from Ocramius/patch-5

Updating dependency to doctrine-orm-module with the newly tagged versions
Merge pull request #39 from bgallagher/master

Allow email field of null
oops, state shoulde be nullable according to ZfcUser schema