adding presentation
Squashed 'tpp/' content from commit 050b571

git-subtree-dir: tpp
git-subtree-split: 050b5712e6337d166125b505ec8d9cb5ff727f03
Merge commit 'fa90f9dcfd9bf0d90cbafcd230c40a7484a61dc3' as 'tpp'
oups. no need for presimages
before pulling subtree
fix for ruby 1.8