Store Flickr API key and secret in external file (and ignore it!)

Add example
Add Flickr setup file template
"Throws" annotations are useless
FlickrTest is now a Scala version of Flickr4Java's AuthExample (yet to be converted into a proper test)
Flickr4Java does not throw exceptions (AuthExample code will be removed)
Delete FLickr4Java's AuthExample code (flickr4java is buggy)
Fix previous commit