Adds test_helper.rb template to the plugin generator.

git-svn-id: http://redmine.rubyforge.org/svn/branches/work@1784 e93f8b46-1217-0410-a6f0-8f06a7374b81

hooks/lib/generators/redmine_plugin/templates/test_helper.rb

@@ -0,0 +1,5 @@
+# Load the normal Rails helper
+require File.expand_path(File.dirname(__FILE__) + '/../../../../test/test_helper')
+
+# Ensure that we are using the temporary fixture path
+Engines::Testing.set_fixture_path