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