title: Asset Catalog Compiler Options missing
body: <p>I just switched a project over to using Asset Catalogs for icons and launch images. It appears that something has gotten borked, though, because the assets are not getting built into the app. I can't be sure, but I suspect the problem is related to the fact that the <strong>Asset Catalog Compiler – Options</strong> panel is missing from my project/target Build Settings. In new apps, or other apps that I have switched over, once the target is using an Asset Catalog that panel will appear. For this project, when I enable an catalog (under the General tab), I get <code>ASSETCATALOG_COMPILER_APPICON_NAME</code> and <code>ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME</code>, but they are listed under <strong>User-Defined</strong> settings, and the other settings that should appear in the 
  Asset Catalog Compiler are missing.</p>
  
  <p>Anyone have any ideas how to coerce Xcode to find these settings?</p>