Support transclusions

[zverok]

page = Infoboxer.wp.get('List_of_The_Simpsons_episodes_(seasons_1–20)')
page.sections('Episodes').sections.first.templates
# => [#<Template[main article](1: "The Simpsons (season 1)")>, #<Template[](1: "The Simpsons (season 1)")>]

The last one is understood as nameless template, with first vairable eq to "The Simpsons (season 1)". In fact, if you look in the page code, you'll see {{:The Simpsons (season 1)}}, which is "transclude page named The Simpsons (season 1)", and should be represented somewhat like #<TranscludedTemplate[The Simpsons (season 1)]>

And, in any case, nameless templates is not a thing and should fail early if found.