Removed gradle-nbm-plugin which is unused since the removal of the experimental embeddable tweetwall. (#435)
Removed gradle-nbm-plugin which is unused since the removal of the experimental embeddable tweetwall. (#435)

fixes TweetWallFX/TweetwallFX#434
fvogler/TweetwallFX,TweetWallFX/TweetwallFX,mklaehn/TweetwallFX,jmichelberger/TweetwallFX,reinhapa/TweetwallFX,svenreimers/TweetwallFX