title: Parse for iOS: Errors when trying to run the app
body: <p>I've been working with the Parse SDK and I followed the quickstep guide. When I try to run, I get these 8 errors. Any ideas as to why? It looks like something to do with the Facebook part of Parse which I'm not using.</p>
  
  <pre><code> Undefined symbols for architecture armv7:
  "_FBTokenInformationTokenKey", referenced from:
    -[PFFacebookTokenCachingStrategy accessToken] in Parse(PFFacebookTokenCachingStrategy.o)
    -[PFFacebookTokenCachingStrategy setAccessToken:] in Parse(PFFacebookTokenCachingStrategy.o)
   "_FBTokenInformationExpirationDateKey", referenced from:
    -[PFFacebookTokenCachingStrategy cacheTokenInformation:] in     Parse(PFFacebookTokenCachingStrategy.o)
    -[PFFacebookTokenCachingStrategy expirationDate] in Parse(PFFacebookTokenCachingStrategy.o)
    -[PFFacebookTokenCachingStrategy setExpirationDate:] in Parse(PFFacebookTokenCachingStrategy.o)
   "_OBJC_METACLASS_$_FBSessionTokenCachingStrategy", referenced from:
    _OBJC_METACLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
  "_OBJC_CLASS_$_FBSessionTokenCachingStrategy", referenced from:
    _OBJC_CLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
  "_FBTokenInformationUserFBIDKey", referenced from:
    -[PFFacebookTokenCachingStrategy facebookId] in Parse(PFFacebookTokenCachingStrategy.o)
    -[PFFacebookTokenCachingStrategy setFacebookId:] in Parse(PFFacebookTokenCachingStrategy.o)
  "_OBJC_CLASS_$_FBRequest", referenced from:
    objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
  "_OBJC_CLASS_$_FBSession", referenced from:
    objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
   ld: symbol(s) not found for architecture armv7
   clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>