remove ul and li min-height and padding bottom. cause some issues in d&d
Merge pull request #53 from arnaudbey/tree

remove ul and li min-height and padding bottom. cause some issues in d&d
fix save containing pattern steps
fixes #54
Merge pull request #55 from arnaudbey/tree

fix save containing pattern steps
fix saving feature. Sortable is still working after saving and pattern nodes display correctly.
reorganize js code.