Fix for old versions of Ruby

Author: mrkn

lib/iruby/application.rb

@@ -123,7 +123,7 @@ def run
       :force,
       :ipython_dir
     ) do
-      def initialize(*args, **kw)
+      def initialize(*args)
         super
         self.name ||= DEFAULT_KERNEL_NAME
         self.force = false

test/iruby/application/register_test.rb

@@ -51,8 +51,7 @@ def setup
           @kernel_json = File.join(tmpdir, "kernels", DEFAULT_KERNEL_NAME, "kernel.json")
           with_env(
             "JUPYTER_DATA_DIR" => tmpdir,
-            "IPYTHONDIR" => nil,
-            "HOME" => nil
+            "IPYTHONDIR" => nil
           ) do
             yield
           end

test/iruby/application/unregister_test.rb

@@ -7,8 +7,7 @@ def setup
         @kernel_json = File.join(tmpdir, "kernels", DEFAULT_KERNEL_NAME, "kernel.json")
         with_env(
           "JUPYTER_DATA_DIR" => tmpdir,
-          "IPYTHONDIR" => nil,
-          "HOME" => nil
+          "IPYTHONDIR" => nil
         ) do
           yield
         end