Merge pull request #7 from rubicks/master

added check for fl_decode_uri in FL/filename.H
sped up colorize
cleanups/comments
extended widget redraw to include Fl::flush
added clone target cursor (xlib only)
clone cursor works in stock FLTK also now
forgot to remove some test defines
clone target didnt redraw when moved
shortened clone cursor drawing code a bit
fixed clone target being drawn in navigator
refactored/centralized drawing to screen using xlib etc
removed fltk-images dependency, using internal png loader now in widgets
wrote own decode uri method
Merge branch 'travis'
Merge pull request #8 from rubicks/master

travis cometh