fix directory handling for source_paths

lite/template.rb

@@ -87,7 +87,7 @@ require "shellwords"
 def add_template_repository_to_source_path
   if __FILE__ =~ %r{\Ahttps?://}
     require "tmpdir"
-    source_paths.unshift(tempdir = Dir.mktmpdir("rails-template-"))
+    source_paths.unshift(tempdir = Dir.mktmpdir("rails-template-") + '/lite')
     at_exit { FileUtils.remove_entry(tempdir) }
     git clone: [
       "--quiet",
@@ -96,7 +96,7 @@ def add_template_repository_to_source_path
     ].map(&:shellescape).join(" ")
 
     if (branch = __FILE__[%r{rails-template/(.+)/template.rb}, 1])
-      Dir.chdir(tempdir+'/lite') { git checkout: branch }
+      Dir.chdir(tempdir) { git checkout: branch }
     end
   else
     source_paths.unshift(File.dirname(__FILE__))