Added config so "/usr/bin/env ruby" works (#344)

languages.json

@@ -1388,6 +1388,9 @@
                 ["\\\"", "\\\""],
                 ["'", "'"]
             ],
+            "env":[
+                "ruby"
+            ],
             "extensions":[
                 "rb"
             ]

tests/data/ruby_env

@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+# 11 lines 3 code 6 comments 2 blanks
+
+=begin
+  Comment that only counts if detected as ruby
+  Comments
+=end
+
+while x > 2 and x < 10
+  x += 1
+end