added pathogen and pencil airline theme

vimrc

@@ -1,8 +1,27 @@
-syntax enable
+" load pathogen
+execute pathogen#infect()
+
+" disable vi compatibility
+set nocompatible
+
+" colorscheme
 set background=dark
-colorscheme solarized
+colorscheme pencil
-set smartindent
+let g:airline_theme = 'pencil'
+" display line numbers
+set nu
+
+" toggle highlight line
+nnoremap <silent> <F4> :set cursorline!<CR>
+
+" enable syntax highlighting
+syntax enable
+
+" set up indenting
 set tabstop=2
 set shiftwidth=2
 set expandtab
+filetype plugin indent on
+
+" 
 iabbrev <// </<C-X><C-O>