Squashed 'contrib/scriptaculous/' content from commit a374ec5

git-subtree-dir: contrib/scriptaculous
git-subtree-split: a374ec531f76291542d5dcccafdddc64f50e5ef3
Merge commit '17fe7c9e7ff0e4dbed3379c018485fcb26c19a47' as 'contrib/scriptaculous'
Added .gittrees file
* switched to newer versions of scriptaculous and prototype js libraries in order to support IE9+