[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

basz/zend-code,DaanBiesterbos/zend-code,MadCat34/zend-code,Ocramius/zend-code,remicollet/zend-code,zendframework/zend-code