Fix project settings - proper definition of Release and Debug settings
Merge branch 'config_nightly' of https://github.com/markusstoll/SparkleShare into config_nightly

* 'config_nightly' of https://github.com/markusstoll/SparkleShare:
  Fix usage of NSImage - object cannot be reused after setting Size NSImage does the caching for us anyway
  Fix Project settings for Release