add dot.colordiffrc
edit dot.vimrc and dot.vim

 * autoload rc files
  * dot.vim/*.vim -> dot.vim/userautoload/*.vim
 * add plugins
  * neosnippet.vim
  * vim-snippets
  * vim-surround
  * YankRing.vim
 * edit keymaps
remove molokai of colorscheme of vim