several plugins added using vundle

"开启目录树导航:help NERD_tree.txt for help
Bundle 'scrooloose/nerdtree'
"括号高亮
Bundle 'kien/rainbow_parentheses.vim'
"A code-completion engine for Vim
Bundle 'Valloric/YouCompleteMe'
"python syntax highlight
Bundle 'hdima/python-syntax'
"快速批量加减注释
Bundle 'scrooloose/nerdcommenter'
remove Auto-complete brackets config

删除了原来手动配置的括号自动补全,准备用插件Raimondi/delimitMate
add plugin Raimondi/delimitMate to auto-complete brackets

also c.vim change map leader from \ to ,