add categories
merge Shougo/shougo-s-github/blob/master/vim/.vimrc
merge old "Search"
merge old "Edit"
merge old "View"
merge old "Syntax"
merge old "Key Mapping" and "Function"
merge old "Platform" and "Other"
Merge pull request #3 from iyuuya/vim_options

カテゴリ別オプション設定