Hash braces are wrongly parsed as scope (block) braces. #208

Description

Braces enclosing hash definitions are parsed as syntax--scope elements (like braces enclosing blocks of code), but they should be parsed as syntax--hash elements (similar to syntax--array for brackets enclosing arrays).

Steps to Reproduce

1. Create the following Ruby code in Atom editor:

{abc: 123}

2. Open Atom's dev tools and inspect the HTML.

Expected behavior:
The braces enclosing the hash definition should have HTML elements:
<span class="syntax--punctuation syntax--section syntax--hash syntax--begin syntax--ruby"> and
<span class="syntax--punctuation syntax--section syntax--hash syntax--end syntax--ruby">.

Actual behavior:
The braces enclosing the hash definition have HTML elements:
<span class="syntax--punctuation syntax--section syntax--scope syntax--begin syntax--ruby"> and
<span class="syntax--punctuation syntax--section syntax--scope syntax--end syntax--ruby">,

Reproduces how often:
Every time.

Versions

Atom : 1.18.0
Electron: 1.3.15
Chrome : 52.0.2743.82
Node : 6.5.0
apm 1.18.1
npm 3.10.10
node 6.9.5 x64
language-ruby : 0.71.0
Windows 7 Pro x64

Additional Information