AutoHotkey setting, remove MacVim Kaoriya,

AutoHotkey.ahk
    - emacs like mappings with Alt key

mac.zshrc
    - remove MacVim Kaoriya aliases

vimrc
    - use Ruby 2.0.0 as default
    - unite history sources settings
    - next tab and previous tab using Alt key
    - TweetVim account icons are not shown in cui mode
    - git-messenger temporary settings