add a heuristic to disambiguate LiveScript from LoomScript

Keying off of `package {`, since LoomScript code must be enclosed in a
package definition, whereas that would be invalid LiveScript

lib/linguist/heuristics.rb

@@ -144,6 +144,15 @@ module Linguist
 
     disambiguate "Gosu", "JavaScript" do |data|
       Language["Gosu"] if /^uses java\./.match(data)
-    end    
+    end
+
+    disambiguate "LoomScript", "LiveScript" do |data|
+      if /^\s*package[\w\W]*{/.match(data)
+        Language["LoomScript"]
+      else
+        Language["LiveScript"]
+      end
+    end
+
   end
 end