title: Cocoapods error: linker command failed with exit code 1 (use -v to see invocation)
body: <p>First time using cocoa pods (latest version) for dependencies in the latest Xcode 7.2.1 with Swift 2.1. I initialize my project folder and then edit the podfile and add my dependencies.  When I run <code>pod install</code> it runs without a hitch until I open my project and try to build. I've tried this with two separate projects (one being brand new for testing) and I get <code>linker command failed with exit code 1 (use -v to see invocation)</code> for both.  My pod file looks like this:</p>
  
  <pre><code>platform :ios, '8.0' #8.0 is minimum supported, right?
  use_frameworks!
  
  target 'Testing Frameworks' do
      pod 'Alamofire', '~&gt; 3.0'
  end
  </code></pre>