Add failing test case for title decoration

When no title-pattern is configured, the HTMLHeadDecorator kicks in
and prevents from using th:text in the content template.

Note that this same test works when using unescaped text "th:utext".
Merge pull request #46 from bclozel/layout-title

Cannot use th:text in content template
Merge remote-tracking branch 'github/master' into dev
Fix for #46, remove text attributes only if a pattern is being used