Adding PHP Composer Integration

I included a composer.json file to make use of Composer in Zend Framework 2 to manage this as a dependency.  Per the usual dependencies I have listed in my ZF2 project, I listed the dependency as "robquistnl/zfcuseradldap" which puts the project in "vendor/robquistnl/zfcuseradldap" .  This may need to be corrected per your instructions to leave it in "vendor/zfcuseradldap" .