Update GraphStore dependency
Refactor calls to createObserver
Enable auto-apply in DesktopAppearance
Fix graphstore call for new table observer
Make the GML exporter's Creator tag syntax conformant
Fix "Plugin Quick Start" link in README.md

Fix the markdown for the "Plugin Quick Start (5 minutes)" link.
Merge pull request #923 from chirayuk/patch-1

Fix "Plugin Quick Start" link in README.md
Merge pull request #920 from count0/master

Make the GML exporter's Creator tag syntax conformant
Bump maven plugins versions
Use Netbeans platform 8 and hide new unnecessary menus