Merge pull request #143 from noesya/master

Prevent runtime autodetection on gem require

Author: byroot

lib/execjs.rb

@@ -2,5 +2,7 @@
 require "execjs/runtimes"
 
 module ExecJS
-  self.runtime ||= Runtimes.autodetect
+  def self.runtime
+    @runtime ||= Runtimes.autodetect
+  end
 end

test/test_execjs.rb

@@ -5,6 +5,7 @@
 
 begin
   require "execjs"
+  ExecJS.runtime
 rescue ExecJS::RuntimeUnavailable => e
   warn e
   exit 2