[vim] remove pyflakes-vim as it's merged in syntastic

and use nasm ft for asm file

.vimrc

@@ -168,6 +168,9 @@ if has("autocmd")
     autocmd BufRead,BufNewFile *.ino set shiftwidth=4
 endif
 
+if has("autocmd")
+        au BufRead,BufNewFile *.asm set ft=nasm
+endif
 " vim -b : edit binary using xxd-format!
 augroup Binary
         au!
@@ -525,8 +528,6 @@ Plugin 'scrooloose/nerdtree'
 "Plugin  'scrooloose/syntastic'
 "Plugin  'majutsushi/tagbar'
 "Plugin  'Yggdroot/indentLine'
-"" Python Code Checking
-"Plugin 'kevinw/pyflakes-vim'
 
 " Omni completion for cpp
 Plugin 'vim-scripts/OmniCppComplete'