title: Duplicate symbol error when using TouchDB and FMDB wrapper together
body: <p>In my app I'm storing data using <code>TouchDB</code>. I've added <code>TouchDB.framework</code>, everything worked fine. Then I had to work with a sqlite database in the same application, and as I'm accustomed  with <code>FMDB</code> wrapper, I added it to the project. On build I received the following error:</p>
  
  <pre><code>duplicate symbol _OBJC_CLASS_$_FMDatabase in:
      /Users/me/Library/Developer/Xcode/DerivedData/.../armv7/FMDatabase.o
      /Users/me/.../TouchDB.framework/TouchDB(FMDatabase.o)
  </code></pre>
  
  <p>I guess that <code>TouchDB</code> framework contains <code>FMDatabase</code> file as well, but it's missing from Headers folder. How to fix this issue?</p>