add simple lua format base on js.

[hxsf]

What does this implement/fix? Explain your changes.

1. I want to format Lua, but need install perl frist? It's not cool.
   so, I use js, and translate it to coffee.

2. the current perl version has some bug like following:

• it will change whitespace in string.
  local a = "a..b...c" will be local a = "a.b.c" (use '.' to represent ' ')

Does this close any currently open issues?

Of course, many of issues about 'Lua' and 'format'.

Any other comments?

yes, I am not good at coffee, so if my code is not friendly to read. just edit it.
BTW, when I use Travis CI, Lua is OK, but other 9 language fail, I do not think I'm causing it.

Checklist

Check all those that are applicable and complete.

• Merged with latest master branch
• Added examples for testing to examples/ directory
• Travis CI passes (Mac support)
• AppVeyor passes (Windows support)

[hxsf]

wait, I found some thing wrong.

local a = -1 will be local a = - 1

I will fix it.