Squashed 'luajit-2.1/' content from commit d6ff3af

git-subtree-dir: luajit-2.1
git-subtree-split: d6ff3afc14eb3580c1aa7985431fa152b135d4c5
Merge commit 'd0a082bc9a3753f078cc5105b7372184a2405de8' as 'luajit-2.1'
moved luajit directory to luajit-2.0
added readline support for luajit 2.1
added cmake files for luajit 2.1
finalize luajit 2.1 support