title: Swift 2 - replacement for the deprecated function extend (Swiftache)
body: <p>I have Swiftache in my Swift 2 project, and after the Xcode 7 update, the following line is complaining (the error is there is no longer an extend method).</p>
  
  <pre><code>public func renderText(text: String) {
          if !renderable {
              return
          }
  
  
          _text.extend(text)
      }
  </code></pre>
  
  <p>So _text.extend(text) is the offending line. What could I replace it with?
  What did the extend method even do, originally? I can't find an equivalent because I'm not familiar with the original method back when it worked in the older version of Xcode.</p>
  
  <p>Thanks!</p>