How to set Principal Class for a loadable bundle?

How to set Principal Class for a loadable bundle?

References

Reference NO 1

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/LoadingCode/Tasks/CreatingBundles.html

Reference NO 2

http://stackoverflow.com/questions/15196093/how-to-set-principal-class-for-a-loadable-bundle

Reference NO 3

http://juliuspaintings.co.uk/cgi-bin/paint_css/more_cocoa_examples/082-PlugIns.pl

Reference NO 4

http://www.stone.com/The_Cocoa_Files/Thanks_A_Bundle_.html

Reference NO 5

http://objc.toodarkpark.net/Foundation/Classes/NSBundle.html

Reference NO 6

http://www.filibeto.org/unix/macos/lib/dev/documentation/Cocoa/Conceptual/LoadingCode/LoadingCode.pdf

Reference NO 7

http://eschatologist.net/blog/?p=20

Reference NO 8

http://www.stuffediggysoftware.com/creatingziplinesources.html