Prefer aliases over shebang config

lib/linguist/languages.yml

@@ -271,6 +271,7 @@ Groovy:
 JavaScript:
   :aliases:
   - js
+  - node
   :ext:
   - .js
   - .sjs
@@ -334,6 +335,8 @@ Myghty:
   - .myt
 Nu:
   :lexer: scheme
+  :aliases:
+  - nush
   :ext:
   - .nu
   - Nukefile
@@ -437,6 +440,11 @@ Redcode:
   :ext:
   - .cw
 Ruby:
+  :aliases:
+  - jruby
+  - macruby
+  - rake
+  - rbx
   :ext:
   - .rb
   - .ru