v2.0.0-6

• [BREAKING CHANGE] Removed 'name' argument from $.ui.fancytree.registerExtension()
  (now the extension object requires a 'name' property)
• [DEPRECATION] Deprecated startEdit/endEdit to use editStart/editEnd
• [FEATURE] New method tree._requireExtension()
• [FEATURE] Fixed d'n'd for ext-table
• [FEATURE] New option titlesTabbable
• [FEATURE] New argument opts for setExpanded() and setActive()
• [BUGFIX] ext-edit: fixed loosing focus and made chainable
• [BUGFIX] ext-filter: fixed navigation for hidden nodes
• Added browser test matrix (saucelabs)