FLUID-5439: Added creating prefs editor tutorial

Added the "Creating a Preferences Editor Using The Preferences Framework" tutorial

converted the following pages to markdown:
http://wiki.fluidproject.org/display/docs/Tutorial+-+Creating+a+Preferences+Editor+Using+the+Preferences+Framework
http://wiki.fluidproject.org/display/docs/Creating+a+Primary+Schema
http://wiki.fluidproject.org/display/docs/Creating+Panels
http://wiki.fluidproject.org/display/docs/Creating+Enactors
http://wiki.fluidproject.org/display/docs/Creating+an+Auxiliary+Schema
http://wiki.fluidproject.org/display/docs/Instantiating+the+Preferences+Editor
http://wiki.fluidproject.org/display/docs/Instantiating+the+Enhancer+and+Settings+Store+Only
http://wiki.fluidproject.org/display/docs/Styling+the+Preferences+Editor