title: Some imports not found in added CocoaPods project
body: <p>I am new to iOS dev, with zero knowledge of Xcode/objc/CocoaPods. While studying Swift I wanted to try integrating an existing Obj-c project using CocoaPods. The project I am including is called CCHMapClusterController. I am getting *.h header "file not found" when building. What is causing this?</p>
  
  <p>Podfile:</p>
  
  <pre><code>platform :ios, '8.2'
  use_frameworks!
  
  target 'TennisBuddy' do
  pod "CCHMapClusterController"
  end
  
  target 'TennisBuddyTests' do
  end
  </code></pre>
  
  <p>I created a "bridge" header file. Compiler is complaining that some of headers are not found (some are). 
  <img src="https://i.stack.imgur.com/1uBIQ.png" alt="enter image description here"></p>
  
  <p>Build settings:
  <img src="https://i.stack.imgur.com/sTnER.png" alt="enter image description here"></p>