don't make showerjs a submodule
Squashed 'showerjs/' content from commit 1fc3e16

git-subtree-dir: showerjs
git-subtree-split: 1fc3e1678ab2bbcfb8f564e114d03fa117d4cd20
Merge commit '410b26ed164cd33026ebf8dea9bcca8211e03285' as 'showerjs'