Added better tmux defaults, gitconfig, and vimrc with improved setup script

vimrc

@@ -29,6 +29,14 @@ map <A-]> :vsp <CR>:exec("tag ".expand("<cword>"))<CR>
  silent! helptags ALL
 "
 
+if &term =~ '^screen'
+    " tmux will send xterm-style keys when its xterm-keys option is on
+    execute "set <xUp>=\e[1;*A"
+    execute "set <xDown>=\e[1;*B"
+    execute "set <xRight>=\e[1;*C"
+    execute "set <xLeft>=\e[1;*D"
+endif
+
 " Nerdtree
 nnoremap <leader>n :NERDTreeFocus<CR>
 nnoremap <C-n> :NERDTreeToggle<CR>
@@ -80,6 +88,13 @@ let g:syntastic_check_on_open = 0
 let g:syntastic_check_on_wq = 0
 nnoremap <C-y> :SyntasticToggleMode<CR>
 
+"" Optional. Configure before enabling
+" let g:syntastic_cpp_checkers = ['clang_tidy']
+" let g:syntastic_c_checkers = ['clang_tidy']
+" let g:syntastic_cpp_clang_tidy_post_args = ""
+" autocmd FileType cpp if stridx(expand("%:p"), "/home/anaber/work/trenton/") == 0 |
+"     \ let g:syntastic_cpp_clang_tidy_args = "-p /home/anaber/work/trenton" | endif
+
 " vim-airline
 let g:airline#extensions#whitespace#enabled = 0
 if !exists('g:airline_symbols')