Rename test directory that was still called gem-wrappers and fix usage of gem-wrappers in the command test

Author: Andy Fleener

test/gem-wrappers/command_test.rb renamed to test/gem-empty/command_test.rb

@@ -25,9 +25,9 @@ def self.remove_spec spec
     subject.program_name.class.must_equal(String)
   end
 
-  describe "wrappers" do
+  describe "gem-empty" do
     before do
-      file = Tempfile.new('command-wrappers')
+      file = Tempfile.new('command-empty')
       @test_path = file.path
       file.close
       file.unlink