remove whitespace possibility from property name regex
add .keep file for propertygui example data folder
Add assignment operator to StageInput which automatically calls changed()
LinearizedTree holds only copies of trees
Merge branch 'master' of github.com:hpicgs/libzeug
Remove stagezeug, treezeug and treeimportzeug
Merge pull request #33 from hpicgs/remove_stage_tree_and_treeimport

Remove stagezeug, treezeug and treeimportzeug
Remove stages, tree and treeimport from Readme.md
Fix cmake config
Merge remote-tracking branch 'origin/master' into scriptzeug

Conflicts:
	source/CMakeLists.txt