Add support for Golo language

![logo-golo](https://f.cloud.github.com/assets/1280212/310461/4ce51ab6-971d-11e2-86ec-7711a1202e20.png) — a lightweight dynamic language for the JVM.

`The world didn't need another JVM language. So we built yet another one. A simple one.`

I add the support of Golo files (with the `golo` lexer in `languages.yml` and some samples (see [old pull-request](https://github.com/github/linguist/pull/453)).

```golo
module hello.World

function main = |args| { 
  println("Hello World")
}
```

some links
- http://golo-lang.org/
- https://github.com/golo-lang
- https://github.com/TypeUnsafe
- https://gist.github.com/k33g/cdb6fc19ce1d1a5b6636
- https://gist.github.com/k33g/916270841da536db12b5
- https://gist.github.com/k33g/31733c66c510a4309979
- https://github.com/rlespinasse/ansi-string-augmentations.golo

BTW .go is for Go, .golo is for Golo ;-) 

On October 10, 2014 10:48:51 PM CEST, Brandon Keepers <notifications@github.com> wrote:
>> @@ -865,6 +865,13 @@ Go:
>>    extensions:
>>    - .go
>>  
>> +Golo:
>> +  type: programming
>> +  color: "#195be0"
>
>What's our strategy for picking colors? A color from the golo logo
>might be more appropriate.
>
>![](http://golo-lang.org/images/logo-golo.png)
>
>---
>Reply to this email directly or view it on GitHub:
>https://github.com/github/linguist/pull/1540/files#r18729956