Make result buttons a button group and adopt styles

Change-Id: I703de5fcb5f7f19e84278a719a64c19c3bc016cc
diff --git a/Gruntfile.js b/Gruntfile.js
index b556928..d9efddf 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -128,7 +128,7 @@
 		            'dev/scss/header/{header,hint,menu,searchbar,vc,datepicker}.scss',
 		            'dev/scss/main/{alertify,intro,koralquery,highlight,kwic,logos,tagger,' +
 		            'main,matchinfo,tree,pagination,query,'+
-		            'resultinfo,sidebar,tutorial}.scss'
+		            'resultinfo,sidebar,tutorial,buttongroup}.scss'
 	             ],
 	      tasks: ['sass'],
 	      options: {