add new deployer `git`
Merge pull request #452 from chenall/plugin-deployer-git

Plugin deployer git
add helper plugins `list_posts`,`get_posts`
list_posts helper update
compatible, optimizing
Unified coding style
added feature to customize server address in console
added ability to bind ip address
added ability to bind ip address
Merge branch 'feature-custom-server-address' of https://github.com/shulhi/hexo into feature-custom-server-address
Merge pull request #469 from shulhi/feature-custom-server-address

Added feature to customize server address in console
Merge pull request #467 from chenall/add_list_posts_helper

add helper plugins `list_posts`,`get_posts`