Update Hy support by adding a reference to an Atom grammar.

.gitmodules

@@ -537,3 +537,6 @@
 [submodule "vendor/grammars/Sublime-Nit"]
 	path = vendor/grammars/Sublime-Nit
 	url = https://github.com/R4PaSs/Sublime-Nit
+[submodule "vendor/grammars/language-hy"]
+	path = vendor/grammars/language-hy
+	url = https://github.com/rwtolbert/language-hy

grammars.yml

@@ -257,6 +257,8 @@ vendor/grammars/language-csharp:
 - source.nant-build
 vendor/grammars/language-gfm:
 - source.gfm
+vendor/grammars/language-hy:
+- source.hy
 vendor/grammars/language-javascript:
 - source.js
 - source.js.regexp

lib/linguist/languages.yml

@@ -1268,13 +1268,13 @@ Haxe:
 
 Hy:
   type: programming
-  ace_mode: clojure
+  ace_mode: text
   color: "#7891b1"
   extensions:
   - .hy
   aliases:
   - hylang
-  tm_scope: none
+  tm_scope: source.hy
 
 IDL:
   type: programming