FLUID-5439: Converted wiki page to markdown

Converted 
* http://wiki.fluidproject.org/display/docs/Connecting+the+Parts+of+a+Preferences+Editor
* http://wiki.fluidproject.org/display/docs/Tutorial+-+Creating+a+Preferences+Editor+Using+the+Preferences+Framework
* http://wiki.fluidproject.org/display/docs/Tutorial+-+Full+Page+Preferences+Editor
* http://wiki.fluidproject.org/pages/viewpage.action?pageId=26969033

http://issues.fluidproject.org/browse/FLUID-5439
I think the "component configuration options" is one that we are not planning to port in this round, so we should probably just leave this link out (same on the 'creating enactors' page).