Remove html_truncated? method on truncated strings

This feature broke marshaling which is required for caching of truncated
strings. Fixes nono#16

lib/html_truncator.rb

@@ -13,7 +13,6 @@ def self.truncate(text, max, opts={})
     opts = DEFAULT_OPTIONS.merge(opts)
     doc = Nokogiri::HTML::DocumentFragment.parse(text)
     str, _, opts = doc.truncate(max, opts)
-    eval "class <<str; def html_truncated?; #{opts[:was_truncated]} end end"
     str
   end
 

spec/html_truncator_spec.rb

@@ -101,11 +101,6 @@
     HTML_Truncator.truncate("<p>Honorificabilitudinitatibus</p>", 5, :ellipsis => '...', :length_in_chars => true).should == "<p>Honor...</p>"
   end
 
-  it "says if a string was truncated" do
-    HTML_Truncator.truncate(short_text, 10).should_not be_html_truncated
-    HTML_Truncator.truncate(long_text, 10).should be_html_truncated
-  end
-
   it "doesn't unescape html entities" do
     txt = <<EOS
 <p>Dans le wiki, le \"titre\" <strong>Log des modifications</strong> s'étale sur toute la largeur de l'écran et la barre de saisie dépasse allégrement la taille dudit écran.<br />