Built app from master with SDK 10.10

The binary checked-in on the same branch of the source was outdated and was built against SDK 10.9. This was a simple release build of the latest code using SDK 10.10. 

Also I checked-in a standard .gitignore for Xcode projects but I did not remove previously checked-in xcuserdata directories.

This will allow users to simply download the Zip and run the latest app without building it. (Consider using Github's release page to publish .app files and remove the .app from the source. I cannot do this for you on your github repo page.)