Added au for json, git alias

+ added git alias for showing the files that were changed/added/removed
for a specific commit
+ added au for json to make it show as JavaScript in vim

vim/vimrc.symlink

@@ -59,6 +59,7 @@ if has("autocmd")
     "autocmd BufWritePost .vimrc source $MYVIMRC
     " save all files on focus lost, ignoring warnings about untitled buffers
     autocmd FocusLost * silent! wa
+    autocmd BufNewFile,BufRead *.json set filetype=javascript
     autocmd BufNewFile,BufRead *.ejs set filetype=html
 endif