title: Parse and facebook sdk -duplicate symbol
body: <p>I have parse, facebook, bolts frameworks in my project but I get this error and I don't know how to solve it.</p>
  
  <p>I tried to remove framworks and add them again.</p>
  
  <p>I'm using xcode 6 and parse library 1.6.</p>
  
  <pre><code>duplicate symbol _OBJC_METACLASS_$_BFMeasurementEvent in:
      /Users/home/Desktop/The Live TV V2/FacebookSDK.framework/FacebookSDK(BFMeasurementEvent.o)
      /Users/home/Desktop/The Live TV V2/Bolts.framework/Bolts(BFMeasurementEvent.o)
  ld: 91 duplicate symbols for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation
  </code></pre>
  
  <p>Any idea?</p>