Upgrading PHPUnit to verify that sebastianbergmann/phpunit#1115 fixed ocramius/ProxyManager#140
Bumping ZF2 dep to >2.2.5, requiring entire framework for test runs
Enforcing ZF dependency to >=2.3 to include zendframework/zf2#5804
Removing enforced zf2 installation for dev deps
Merge pull request #145 from Ocramius/hotfix/issue-#140-phpunit-phpt-breakages

Upgrading PHPUnit to verify that sebastianbergmann/phpunit#1115 fixed ocramius/ProxyManager#140