Abstraction model for yii2-git-view and yii2-hg-view projects

Implements common interface for PHP VCS view systems. You can to use it for your projects, like "yii2-svn-view" or other.

How it to use see at:

• https://github.com/kalyabin/yii2-git-view
• https://github.com/kalyabin/yii2-hg-view
• https://github.com/kalyabin/comitka