title: Eureka SelectableSection get value from selectedRows
body: <p>I have problem with <code>selectedRows()</code> in <code>SelectableSection</code>.</p>
  
  <p>Using Xcode 8, Swift 3, Eureka 2.0.0-beta.1.</p>
  
  <pre><code>func viewDidLoad() {
      let branch_section = SelectableSection&lt;ImageCheckRow&lt;String&gt;&gt;("Branches", selectionType: .multipleSelection)
      branch_section.tag = "branch_section"
      for branch in branchList {
          let branchStr = String(branch.id)
          branch_section &lt;&lt;&lt; ImageCheckRow&lt;String&gt;(branch.name){ row in
              row.title = branch.name
              row.selectableValue = branchStr
              row.value = nil
          }
      }
  }
  
  
  @IBAction func saveFilter(_ sender: AnyObject) {
      let branch_section = self.form.sectionBy(tag: "branch_section") as? SelectableSection&lt;ImageCheckRow&lt;String&gt;&gt;        
      invoiceParams["branches"] = branch_section!.selectedRows().map({$0.value!})
  }
  </code></pre>
  
  <p>now i have problem with this line <code>invoiceParams["branches"] = branch_section!.selectedRows().map({$0.value!})</code></p>
  
  <blockquote>
    <p>map' produces '[T]', not the expected contextual result type
    'AnyObject?'</p>
  </blockquote>
  
  <p>What is problem here? This worked with previous versions on swift 2.3.</p>