[2.2.0rc1] Release preparation
[2.2.0rc1] Release preparation

- Updated all component composer.json files to reflect new branch aliases
- Updated changelog
- Updated readme

weierophinney/zend-servicemanager,matwright/zend-servicemanager,prolic/zend-servicemanager,akrabat/zend-servicemanager,MadCat34/zend-servicemanager