Started ext-clones
clones: node.clonesFind() returns list of nodes (not keys)
getNodesByRef()
Neue Funktion node.isClone(). Fixed refKey map für nocht-clones
Fixed clone list length
Merged latest changes from master
improved docstrings
[ext-clones] new extension that introduces `refKey`, which may occur     multiple times in one tree
[ext-clones] highlight original node if a clone is created
[ext-filter] support ext-table (inclusive 'hide' mode). Closed #36
removed some prints
[ext-persist] Added sample for recursive loading of lazy structures

Closed #150
bump to 2.0.0-8
Merge branch 'master' into clones

Conflicts:
        CHANGELOG.md
	demo/sample-ext-persist.html
	src/jquery.fancytree.persist.js
	test/test-ext-table.html
[ext-clones] New option highlightActiveClones
Fixed sample url
Fixed error when trying to drag table headers

Closed #151
Closed #117:  Invalid node height with XHTML
Merge branch 'master' of https://github.com/mar10/fancytree
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