Fix View.content and View.global_content when options are passed

[MikeAndrianov]

Currently you can't pass some options (like it specified in the readme) because error is present: undefined function content/5

This PR fixes behaviour and allows to run this code

<%= content(@conn, "Ident", :html, id: "my-id", classes: "more classes") do %>
  <h1>Title</h1>
<% end %>

without errors.

[jamonholmgren]

🎉 Thanks @MikeAndrianov , just released Thesis 0.3.2 which should contain this fix. 🎉

Really appreciate your help!