Updated the composer constraint

Fixes #72
Add use statement where it's necessary
Merge pull request #74 from davidbarratt/master

Fix documentation (add "use" statement)
Update composer.json

provide a branch alias
Merge pull request #78 from bendavies/branch-alias

Provide a branch alias.
Update composer.json
Merge pull request #83 from totaltrash/master

Updated composer.json for Symfony 2.3
remove old namespace warning from README

Figured it wasn't nearly as useful these days.
Merge pull request #93 from jrobeson/patch-1

remove old namespace warning from README
Fixed cs
Merge pull request #95 from MyKiwi/patch-1

Fixed cs
Update composer.json
Merge pull request #99 from rybakit/patch-1

Update composer.json
Dependency on v1.0.0 of data-fixtures
Fixed the branch alias for master
[docs] do not enforce dev-master in composer.json
Composer should only update current dependency

Executing `composer update` will update all composer dependencies which can lead to undesired dependencies upgrades.

Instead, we should only call composer for update the current bundle package
Merge pull request #112 from rodrigodiez/patch-1

Composer should only update current dependency
Fix LoadDataFixturesDoctrineCommand help
Merge pull request #109 from garak/patch-1

[docs] do not enforce dev-master in composer.json