New sharness/test vim syntax

Hello,

It gets a bit tedious to see all the tests in the same color, so I wrote my own vim syntax file so that at least the body of test_expect_success is highlighted properly.

I've updated it to make it handle more cases, and the result doesn't look bad at all:

https://i.imgur.com/qDgvjtu.png

You can find it on my dotfiles:

https://github.com/felipec/dotfiles/blob/master/.vim/syntax/sharness.vim

What I do is place it on ~/.vim/syntax/sharness.vim, and then add the following to my ~/.vimrc:

  au! BufRead,BufNewFile */git/t/*.sh set ft=sharness

I hope you find this useful.

Cheers.