Update travis to use 2.3.2
Add JRuby to travis.
Add spec dir to include path for easy spec_helper require.
Migrate test database after development database seems to be needed.
Prefix test images for easier cleanup.
Use postgresql as sqlite does not even work with redmine.
Save screenshots in rdb tmp dir instead redmine tmp dir.
Add id option to render_rdb_menu to allow selecting specific menus in specs.
Delegate spec task options to rspec.
Do not use transactions in specs.
Add spec helper to select rdb menu items.